Man who helps invent death machine becomes a little concerned about the morals of death machines well after he's done making them. I despise Feynman for being an overall piece of shit, I'm not going to make myself care that he thought a little more deeply about it after the fact.

His Wikipedia entry is the best I can really suggest, mostly because it's been so long since I formed an opinion on mr Feynman to remember where I learned how odious he was. Here's the choice part of his life that I'm specifically referring to, about one of his memoirs. I'm just quoting wiki here.

Feynman has been criticized for a chapter in the book entitled "You Just Ask Them?", where he describes how he learned to seduce women at a bar he went to in the summer of 1946. A mentor taught him to ask a woman if she would sleep with him before buying her anything. He describes seeing women at the bar as "bitches" in his thoughts, and tells a story of how he told a woman named Ann that she was "worse than a whore" after Ann persuaded him to buy her sandwiches by telling him he could eat them at her place, but then, after he bought them, saying they actually could not eat together because another man was coming over. Later on that same evening, Ann returned to the bar to take Feynman to her place. Feynman states at the end of the chapter that this behaviour was not typical of him: "So it worked even with an ordinary girl! But no matter how effective the lesson was, I never really used it after that. I didn't enjoy doing it that way. But it was interesting to know that things worked much differently from how I was brought up."

This passage does not mention his particular affinity for attempting to seduce coeds at Caltech. Or secretaries. Or basically any woman that moved.