Boys will be Boys???

So every now and then we catch these two guys e-mailing each other and the conversations are quite odd. Let's call them Frank and Beans, here is how the conversation typically goes:

Frank: How's it going?
Beans: Ok. I'm thinking of having lunch at Taco Bell. I have to pay my phone bill. So if a girl asked you to cum in her ass would you?
Frank: Sure
Beans: I can't stick it in a girls pooper, even if she wanted me to.
Frank: Oh, I have no problem with that.
Beans: Describe to me how you would lick pussy.
Frank: (silence)
Beans: Describe to me what you would do to a chick. Get all graphic about it, you can do it on the phone or through e-mail.
Frank: I like licking pussy.
Beans: Get graphic, tell me about it. What would you do to a chick?

This is generally how the thread goes. Beans is always trying to get Frank to describe sexual acts and Frank really doesn't seem to enjoy the conversation at all. They both talk about their various female conquests and Beans seems to be straight. I just can't figure out why he consistently badgers Frank to talk in detail about sex acts.

I would never walk up to my friend "Jennifer" say, "Describe to me what you would do to Johnny." Of course, women are nasty with each other so "Jennifer" probably would have already offered up extreme details. Being that it would be in a group of women it would soon turn into a note taking session on various styles and methodologies, but I digress...

The thing is...Beans doesn't even present the request in the context of a learning opportunity. Why doesn't Frank just say, "What the fuck Beans! Go get your rocks off somewhere else, what is wrong with you??!!"