Here's an answer that is a little more serious. A relationship is supposed to make both of you happy. Does yours?
If you have really different views that are irreconcilable, you likely are not meant to be with each other. Not in this day and age. If you were living in the middle ages, the question would not exist. Now it does. So ask.
End a relationship when it involves pressure to have sex.
Stretch before swimming as to protect her muscles. Some safety precautions to take would be having proper equiptment such as goggles and/or nose/ear plugs. Since it's a public pool, if she is under 18 it would be a good idea to have parental guidance while at the pool as well as making sure there is a lifeguard on duty.
