as a school bus driver I was forced to attend a lecture and video tape on the dangers of blood born pathogens and there dangers.
It was an osha thing.
Any way the main fact that it is dangerous and should be avoided. The HIV and hepatitis C and B are transmitted via blood. And while you would think that your Partner should be HIV free. It is very possible to have hepatitis C and not even know it. That is why Tatoo's are very dangerous, there was a survey that said that more than 50 percent of people that have tattoos have hepatitis c(don't know about 50 % but allot of them do anyway)
I of course am not a doctor but we do have one on the group I think his post in the past sure sound like it. How say yea EE norcord.

My vote is lets keep the blood in the body during play.