How to find out if my boyfriend is having an affair with my dad?

I have a very strong suspicion that my boyfriend is having an affair with my Dad, How can I find out for sure?

stick your finger up his but and see how loose he is hahaha

What my dads? or my boyfriends?

thats gross ...

Well this is very tricky. I suggest you start with your Dad because he is ALWAYS going to be your Dad. Just ask him if he likes your boyfriend and respects him. He is most likely to say yes (some Fathers are protective of who their kids date). Try and figure out his tone and the way he says it. If you still have your suspicions confront him - say it outright and say that you have a right to know. Do it however you want, I cannot tell you how because I do not know your Dad's attitude. If you cannot get anything out of him, if his body language is negative and if he chooses to do something and says that you will talk about it later and never do then it is time to confront your boyfriend. Again tell him outright and tell him that you do not trust your Dad in this area and are starting to suspect him. He may get aggressive.

If that does not work out then I suggest that you bring them together and talk to them. Be confident, get your own way.

uhm..
Your dad Fu*king you Boyfriend ?
Damn..
Thats tough..
Why do you think that ?

so your boyfriend is bisexual?
but just come straight out and ask him would be your best bet.

May I ask what lead you to this suspicion?

uhm.
Well..
ummm...Thats tough.
Why do you think this?