I am a forty-year-old man with an odd fetish. Laps turn me on: women's laps. Specifically, I love laying my head in a woman's lap and sitting on a woman's lap.
Before I write more, I should explain that I'm not an infantilist. Infantilists like to pretend they are babies. They like to wear diapers and be fed with a bottle. I'm not into any of that stuff. I don't want to be a baby. I definitely don't fantasize about my own mother!
I do share some desires with "adult babies." I love to suckle on a woman's breast. In fact, a major fantasy of mine is laying with my head in a woman's lap and sucking on her nipples. I would love to suckle while sitting in her lap, but that's not easy to do without contorting myself into an uncomfortable position. But even when I'm being breastfed, I don't imagine that I'm a baby. It just feels like a girl is loving me and taking care of me.
What I want is a roll-reversal of the girlfriend sitting on her boyfriend's lap. But I don't want to be a girl. I don't wear women's clothes, and I'm not attracted to men. I'm somewhere in same ballpark as the S&M people. I like to be dominated. But I don't like pain or cruelty. I simply want to feel that someone is taking care of me -- that someone is supporting me completely -- and the way I feel that the best is by sitting on a woman's lap.
There's a more common fetish (believe it or not) for being carried. There are actually quite a few men who like to be carried by women (do a web search for "lift and carry" if you don't believe me.) I can get into that too, but I like sitting-on-laps better. That's lucky in a way, because there aren't that many women who can carry a man, but most women can hold me on their laps. I'm a fairly small guy. I'm 5'7" and about 170lbs. Most women can handle my weight.