21. So it is not at all surprising that the rate of orgasm during coitus is low. 22. Reluctant to impregnate her, Onan commits coitus interruptus, spilling his seed on the ground. 23. The retired professor attacked what he described as the " tyranny of coitus ." 24. In Latin literature, this is known as " coitus sine ejaculatione seminis ". 25. Barrier methods, coitus interruptus, and spermicides must be used at every act of intercourse. 26. Modern readers of course understand Onan's act not as masturbation but as coitus interuptus. 27. Listing " Billings method " alongside " coitus interruptus " does not provide such a context. 28. She seduces him and ten seconds later they are lying in bed together post-coitus . 29. The following morning they have sex again, but mid-coitus Ryan s friend calls. 30. In addition, acid phosphatase levels in high concentrations is a good indicator of recent coitus .
