How vigourous would sex/ masturbation have to be to cause it to snap? Cold it snap from sicking to te inside of your boxers when you get an erection?
Oh and how would using a condom affect, would it make it less likely to split? (I will use one anyway, but I wanted to mention I meant protected sex)
I don't think your boxers will break it, but sometimes it happens during sex.
When you have sex, make sure that you have lots of lubrication, either natural or artificial and be careful to penetrate slowly and carefully, so as to avoid tearing your frenulum.