Huh. That's really interesting. I know that for me kissing is as much of a sexual act as sex is. So I (as a bi female) get as much sexual pleasure out of kissing women as I do men. But I don't honestly see myself ever falling in love with a woman either. I'm not saying it's impossible, I've just never had those sorts of feelings for another woman before. But then I'm also a woman, so possibly it's different for women?
My SO is bi also, but he's had extremely limited same-sex experience, mostly I suppose because he's had an extremely limited number of sexual relationships period. I believe for him it's also just sexual, and not a love sort of thing, but I have no idea if he likes the idea of kissing other men, or if he's only interested in the below-the-belt stuff. I should ask him!