Have you ever lost your bikini top while swimming?

Well dang it young feller, us older guys have to have something to cover our man-boobs! And because all the bikini designers only design them for the girls, they never fit us well endowed fellers too well.
So, to answer your question, you young whippersnapper, yes it does happen quite frequently to us fellers, too.

Too many times. Most often from waves near the shore or when diving in a pool

My friend's boob fell out of her bikini and we kept trying to point it out for like 5 whole minutes XD

I've never gone to the beach in a bikini. I'd just wear a normal tank top and shorts. I do plan on wearing one this year and I'll do whatever I can to not let it fall off.

Ummmmm I wear a shirt when I swim. So yes, I have lost my top while swimming.

Well.. thank you for messing everything up for me. Now I can't state the obvious. I'm going to bed feeling sad now. I hope you feel bad. You should feel bad. You should.