I just trim every week.
I shaved a while ago, but didn't like the feeling. Used a sensitive creme for after shaving though and had no problems.

Would be to risky for me. I like my life and being healthy.
You never know what the guys did last week, or the one before.
Tests are only valid if the last possible exposure was month before.

A totally open relationship would not be anything for me. But sometimes to get in a third, would be okay. Especially, if this wouldn't be a "one-time-thing" but more a kind of affair/threesome-relationship.