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STUDY QUESTION Does offering the Pleasure&Pregnancy (P&P) programme rather than expectant management improve naturally conceived ongoing pregnancy rates in couples diagnosed with unexplained infertility? SUMMARY ANSWER The P&P programme had no effect on the ongoing pregnancy rates of couples with unexplained infertility. WHAT IS KNOWN ALREADY Underpowered studies suggested that face-to-face interventions targeting sexual health may increase pregnancy rates. The impact of an eHealth sexual health programme had yet to be evaluated by a large randomized controlled trial. STUDY DESIGN, SIZE, DURATION This is a nationwide multi-centre, unblinded, randomized controlled superiority trial (web-based randomization programme, 1:1 allocation ratio). This RCT intended to recruit 1164 couples within 3 years but was put on hold after having included 700 couples over 5 years (2016–2021). The web-based P&P programme contains psychosexual information and couple communication, mindfulness and sensate focus exercises aiming to help maintain or improve sexual health, mainly pleasure, and hence increase pregnancy rates. The P&P programme additionally offers information on the biology of conception and enables couples to interact online with peers and via email with coaches. PARTICIPANTS/MATERIALS, SETTING, METHODS Heterosexual couples with unexplained infertility and a Hunault-prognosis of at least 30% chance of naturally conceiving a live-born child within 12 months were included, after their diagnostic work-up in 41 Dutch secondary and tertiary fertility centres. The primary outcome was an ongoing pregnancy, defined as a viable intrauterine pregnancy of at least 12 weeks duration confirmed by an ultrasound scan, conceived naturally within 6 months after randomization. Secondary outcomes were time to pregnancy, live birth, sexual health, and personal and relational well-being at baseline and after 3 and 6 months. The primary analyses were according to intention-to-treat principles. We calculated relative risks (RRs, pregnancy rates) and a risk difference (RD, pregnancy rates), Kaplan–Meier survival curves (live birth over time), and time, group, and interactive effects with mixed models analyses (sexual health and well-being). MAIN RESULTS AND THE ROLE OF CHANCE Totals of 352 (one withdrawal) and 348 (three withdrawals) couples were allocated to, respectively the P&P group and the expectant management group. Web-based tracking of the intervention group showed a high attrition rate (57% of couples) and limited engagement (i.e. median of 16 visits and 33 min total visitation time per couple). Intention-to-treat analyses showed that 19.4% (n = 68/351) of the P&P group and 22.6% (n = 78/345) of the expectant management group achieved a naturally conceived ongoing pregnancy (RR = 0.86; 95% CI = 0.64–1.15, RD = −3.24%; 95% CI −9.28 to 2.81). The time to pregnancy did not differ between the groups (Log rank = 0.23). Live birth occurred in 18.8% (n = 66/351) of the couples of the P&P group and 22.3% (n = 77/345) of the couples of the expectant management group (RR = 0.84; 95% CI = 0.63–1.1). Intercourse frequency decreased equally over time in both groups. Sexual pleasure, orgasm, and satisfaction of women of the P&P group improved while these outcomes remained stable in the expectant management group. Male orgasm, intercourse satisfaction, and overall satisfaction decreased over time with no differences between groups. The intervention did not affect personal and relational well-being. Non-compliance by prematurely starting medically assisted reproduction, and clinical loss to follow-up were, respectively, 15.1% and 1.4% for the complete study population. Per protocol analysis for the primary outcome did not indicate a difference between the groups. Comparing the most engaged users with the expectant management group added that coital frequency decreased less, and that male sexual desire improved in the intervention group. LIMITATIONS, REASONS FOR CAUTION The intended sample size of 1164 was not reached because of a slow recruitment rate. The achieved sample size was, however, large enough to exclude an improvement of more than 8% of the P&P programme on our primary outcome. WIDER IMPLICATIONS OF THE FINDINGS The P&P programme should not be offered to increase natural pregnancy rates but may be considered to improve sexual health. The attrition from and limited engagement with the P&P programme is in line with research on other eHealth programmes and underlines the importance of a user experience study. STUDY FUNDING/COMPETING INTEREST(S) Funded by The Netherlands Organisation for Health Research and Development (ZonMw, reference: 843001605) and Flanders Research Foundation. C.B.L. is editor-in-chief of Human Reproduction. H.W.L. received royalties or licences from Prometheus Publishers Springer Media Thieme Verlag. J.B. received support from MercK for attending the ESHRE course 'The ESHRE guideline on ovarian stimulation, do we have agreement?' J.v.D. reports consulting fees and lecture payments from Ferring, not related to the presented work, and support for attending ESHRE from Goodlife and for attending NFI Riga from Merck. A.H. reports consulting fees by Ferring Pharmaceutical company, The Netherlands, paid to institution UMCG, not related to the presented work. H.V. reports consulting fees from Ferring Pharmaceutical company, The Netherlands, and he is a member of the ESHRE guideline development group unexplained infertility and Chair of the Dutch guideline on unexplained infertility (unpaid). M.G. declares unrestricted research and educational grants from Ferring not related to the presented work, paid to their institution VU Medical Centre. The other authors have no conflicts to declare. TRIAL REGISTRATION NUMBER NTR5709. TRIAL REGISTRATION DATE 4 February 2016. DATE OF FIRST PATIENT'S ENROLMENT 27 June 2016. [ABSTRACT FROM AUTHOR]

The microstructures, mineralogy and chemistry of representative samples collected from the cores of the San Andreas Fault drill hole (SAFOD) and the Taiwan Chelungpu-Fault Drilling project (TCDP) have been studied using optical microscopy, TEM, SEM, XRD and XRF analyses. SAFOD samples provide a transect across undeformed host rock, the fault damage zone and currently active deforming zones of the San Andreas Fault. TCDP samples are retrieved from the principal slip zone (PSZ) and from the surrounding damage zone of the Chelungpu Fault. Substantial differences exist in the clay mineralogy of SAFOD and TCDP fault gouge samples. Amorphous material has been observed in SAFOD as well as TCDP samples. In line with previous publications, we propose that melt, observed in TCDP black gouge samples, was produced by seismic slip (melt origin) whereas amorphous material in SAFOD samples was formed by comminution of grains (crush origin) rather than by melting. Dauphiné twins in quartz grains of SAFOD and TCDP samples may indicate high seismic stress. The differences in the crystallographic preferred orientation of calcite between SAFOD and TCDP samples are significant. Microstructures resulting from dissolution-precipitation processes were observed in both faults but are more frequently found in SAFOD samples than in TCDP fault rocks. As already described for many other fault zones clay-gouge fabrics are quite weak in SAFOD and TCDP samples. Clay-clast aggregates (CCAs), proposed to indicate frictional heating and thermal pressurization, occur in material taken from the PSZ of the Chelungpu Fault, as well as within and outside of the SAFOD deforming zones, indicating that these microstructures were formed over a wide range of slip rates. © 2014 Elsevier Ltd.