I've never actually thought about it alot,
but of course I would want to know, lol I think everyone actually wouldn't mind knowing but they wanna seem "respectful" and give them their privacy. Obviously it's very personal and none of our business, but if the question is whether I would want to know, yes, I'd love to know that about NEWS and DBSK members =D
NEWS is kind of old now though, Yamapi's like 24 I think, I'd be surprised if he hasn't lost his virginity. Koyoma is 26 and I would be surprised if he has lost his lol xD
And in DBSK I would want to know specifically if YunJae is real, because maybe thats how they lost theirs