Participating wouldn't be what exposed them to higher risk in the situation you've outlined. This is the sort of strategic wordplay I'd expect from the social sciences.
I think it's a legitimate, if small, concern. There's a possibility that people participating would be more likely to take a roll of the dice. Yes it's stupid, but people do stupid things all the time, particularly when it comes to sex.
Obviously I'm all for the research, I'm just interested to hear if/how they handle it.
