Ive had similar problems on numerous occasions. I met a girl on tinder who looked stunning in her profile picture! we went out for a few drinks and one thing led into another. However, I woke up the next morning lying in bed next to this fat ugly bird who looked nothing like her profile pic without make-up!
The next time that happens I'm taking them to court for impersonating a beautiful woman and tricking me
Seriously though to me it just sounds like the guys involved are gay/bi and in denial. Even blindfolded how could you not realize! Not to mention meeting someone you don't know and agreeing to be blindfolded or bound is rather naive!
Plus only the FOURTH guy thought to take the mask off and realised his mistake! Did the police go to the other 3 men before and say "we think you might have 'accidentally' had sex with a man!" At which point presumably they all said "oh yes, he tricked me! I'm not gay and didn't realise at the time!".