Well I recently broke up with my ex. But if we were together, I would first be concerned because they would be too small for him and would be worried about them ripping. Especially the nice, expensive, lacy underwear!

Aside from that, it wouldn't be my cup of tea personally but if he wanted to go out and buy his own and wear them for fun/comfort/whatever, I'd be fine with it. But it certainly would not turn me on. I try not to judge personal preferences as long as the aren't harmful to anyone else!