Wear condoms. Usually several are provided. Go at your pace. Don't resort to viagra or cialis to go several rounds. I've always heard that could lead to early dependence on those drugs. Ecstasy also has drawbacks, so just go at it naturally and have fun.
Extend the foreplay, so you can recover for the second, third, and fourth round. And use cortizone to treat your penis afterward. You'll be sore and probably discolored down there for a while.
How'd it go, or should I say cum?