How soon did he withdraw after ejaculation?
RAH – It makes sense that after ejaculation, conception odds will be improved if the sperm have only one place to go — through the cervix, into the uterus, and toward the tubes! Therefore, if at all possible, the man should try to keep his penis inside his partner for as long as possible (or feasible) after his orgasm. If used in conjunction with the female-orgasm-afterwards recommendation (see Sec. 10.11), this can be an excellent way to propel the sperm in the right direction. It may be difficult logistically, but the effort may pay off. – RAH BTW, another intercourse fertility-hint: If you can manage it, try to have your partner stay inside for a while after orgasm, as deep as possible — it makes a good barrier, and keeps the semen concentrated as close to the cervix as it can get. Some people recommend putting in a diaphragm or cervical cap after intercourse for the same reason, but I think this runs the risk of excluding some of the sperm, since those barriers fit very close to
