sex vs. sex

It seems to me that if the women who had sex in the jail cell had been men, the guards wouldn't have spent a bunch of time watching. They would have burst in and beaten them half to death. Or worse.

Can someone explain that to me? Why is sex between two women such a spectator sport for straight men, but sex between two men is so threatening? (Yes, I'm generalizing. Suck it up. Pun intended.)

Also, you gotta know that for the first few minutes, they had to be saying, "No way! They're not going to... OMG! They are! Holy shit! Dude! Check this out! OMG! They're not going... WOW! They wouldn't really... OMG! Do you think we should break it up? Nah... they're not going to... OMG! DUDE!"