Hire a couple of body guards and make sure to have some cops ready to be called. Proceed to wear sparring gear over Kevlar everything, and protect your groin. Wear a crash helmet and booby trap the whole house so whoever's trying to hurt you during love will have a long way to get there. And make sure her dad isn't there, otherwise you're in for an ass whooping.
Just practice using a condom before jacking it, not that hard.