Coitus interruptus

Of 756 Norplant users (mean duration of use 3.08 years) most had previously used coitus interruptus as a contraceptive method and chose Norplant because of its effectiveness, despite the fact that adverse effects were detected in 80% (39). There were bleeding problems in 70%. Pregnancy occurred in only one case. Discontinuation because of bleeding problems occurred in 38%. 

In other woids, Onan s act was not masturbation but coitus interruptus, withdrawal of the penis from the vagina before ejaculation. His crime was not self-abuse or sexual self-satisfaction, but refusal to comply with the law of the Levirate and beget a son with his brother s widow. 

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