|"the penis secretes small amounts of precum, which contains sperm."
Fiona, you should be entirely accurate if you're going to go around posting that constantly.
Precum doesn't contain sperm by default. It *can* contain it, however that is unlikely unless the guy had just had sex or pleasured himself and orgasmed already. Usually, peeing will "clean the guy out" - but it's still risky.
Not saying pulling out is a good method, but you should definitely put the straight facts out, it's not something you should be using as a pure scare-tactic, and can destroy your credibility with some people.
Pulling out, according to wikipedia, has about the same perfect-use success rate as condoms though, interesting side-fact.
Pill: .3% fail rate
Condom: 2% fail rate
Coitus Interruptus: 4% fail rate
Pill: 8% fail rate
Condom: 10â18% fail rate
Coitus Interruptus: 15-28% fail rate