This explains all the arms I wake up next to.
As a side-note, all men experience phenomena known as "pre-orgasm anticipation" and "post-orgasm regret." In the former state, men pursue orgasm no matter what the cost. This includes lowering your standards and potentially sleeping with someone you’d never consider during a sane testosterone-free moment; in the latter state -- post-orgasm regret -- men feel trapped and want to flee.
Ian Kerner, Ph.D., has a doctorate in Clinical Sexology and is the author of She Comes First: The Thinking Man's Guide to Pleasuring a Woman. To visit his website, click here. To learn more about She Comes First, click here.