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Everyone who thinks that this is something that would make "a lot of guys" insecure makes me think that I have lived a charmed life. I am bisexual, been married, was in my first threesome when I was 20, lived a poly lifestyle for almost 10 years... and have since decided that in my late 30s I am done with all that and am now settled down with my to-be second spouse.
Perhaps I chose well in that the men and women I've been with have been mature adults, often older than me, with enough adventure under their belts that we can understand each other. My fiancee and I don't dwell on our pasts, but we know we have them--she's also got a varied sexual resume. Generally speaking, my sex life has not been a source of concern to my partners.
A partner's sexual experience can be an advantage if you're secure in yourself. As a boyfriend of mine once observed, he thought it was great that I'd experimented because I'd had a chance to get some things out of my system. And you know, he was right. I've done most things that appeal to me so I don't have to wonder what I'm missing when I choose to put more energy into other parts of my life.