I have inconsiderate (and dirty) friends - How do I handle?

[CappyAA]

Ok, so this is from Friday night. I went to drink over my buddy B's place. He's one of my best friends. I had 2 phone calls from other friends. J was a guy I went to high school with who lives in the area, and C is a girl I was friends with from college. They did not previously know each other. I asked my friend if they could come over and he had no problems.

They came over and we all went out to the bar with B's girlfriend and her friend who I'm kind of dating. We were drinking all night long and getting drunk. My friend J came up to me and asked if he could try to hook up with C. I told him that would be awesome, and he should definitely try it assuming he'd try to get her back to his place.

We all went over to my other friend B's place after the bar and were hanging out. We realized that C and J "disappeared" and quickly heard them in the bathroom together. They ended up spending 45 minutes possibly having sex in my friend B's bathroom.

B was a little pissed (not at me) that random people just had sex in his bathroom. And I felt bad because they were my friends that I invited over there. I haven't spoken with them since other than a potentially "over-the-line" email. But do I have the right to be mad at them for putting me in that spot? Or should I just forget about it all and just never mix those 2 groups of friends again?