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In my over-two-decades' worth of relationship experience, I've never seen any good come out of revealing details of one's sexual past. The Madonna/Whore Syndrome is alive and well. For many guys, even one past lover is one too many. And as for non-traditional sex, e.g., threesomes, fetishes, etc., fuggedaboutit. Like Megan said, lots of guys have their egos wrapped up in the fantasy of being The One and Only for their girlfriends. Destroy that fantasy and you put your whole relationshp at risk.
As a woman, it's a real pain to negotiate the minefield that is modern sexuality. Act too aggressive and/or experienced, risk being treated like a slut. Act too prim and proper, risk being sexually unfulfilled. I envy guys for their ability to go out and get some anytime they feel like it, with no social fallout whatsoever! I have no idea what that feels like...
The only thing about which the BF has a right to ask is the possibility of STDs. I find it interesting, and telling, that LW's BF's harangue apparently never touches on that subject. BF has no concern about LW's physical or emotional well-being; he's just into pouting like the big baby he is. I agree with Cary; DTMFA, and next time, when your lover asks you how many men you slept with, smile sweetly and say, "Why, Sugarbuns, what other men? Being with you, I've completely forgotten."