Your wife may have been with discharge and you could've easily harbored her blood in small amounts. This is why most people encourage protected sex with the unknown. However, it's your wife and its a little different.

Stop stroking the chicken! If you and your wife are faithful to one another, it probably would not be related to an std. However, if you are unaware of her history and the problem continues to persist, go to the doc. If you urinate and see blood, that is a completely different story.

In my opinion, nothing to go crazy about unless it happens again.

I found blood on my boyfriends's sheets (looks like a small cut bled) and I have no idea how it got there. I read what you said that it could have come from a penis. It was on my boyfriend's side of the bed and he says he doesn't know. This is the 2nd time I have seen this. Last time he said it must have cut himself. I'm not on my period so it can't be from me, and it wasn't there before we went to bed. What could this be? Should I be worried?

Anytime there is blood from your penis you should be worried! Go to the Dr. !!!!

dude are you shure that you just got the blood from ur wife?