There are a few issues here.

1. Do you really want a stranger who may be potentially wrong to be in your home.

2. Are you willing to risk halving your life expectancy with AIDS, hep ABC and the basic poxes?

3. Are you really willing to "open up" the relationship, knowing that it's a one way street?

These questions asked, the cheapest in risk and probably the least stressful way is to find a guaranteed clean professional, get a room and enjoy as an isolated experience.

I'm a little cynical to expect the necessary trust being found among friends and acquaintances.

__________________
Calm, quiet, smooth, devastating