You always hear about studies that say "___ contains more bacteria than a public toilet seat." For example, the keyboard you're typing on has far more bacteria on it than the toilet seat in your home. In all actuality, many people were taught NOT to sit on public toilet seats, so they either hover half-way over the seat or they use sheets of toilet paper. Basically, if no one else is touching it it would be a lot safer for you to touch it.

Toilets and urinals have become even more sanitary since the popular usage of the "automatic flush" thingamawhoseit by just about every major business ever. Basically, as long as the head of your penis isn't submerged in the water in the bowl, you'll be okay.