There's a gay sex joke video that I'm going to surprise my friends with.
Is it appropriate to send your friend that joke video?
I think it's a very funny and naughty joke.
That is a very rude thing for you to do. It's wrong to treat gay people as a joke. It is very impolite and your friend might not think it is funny at all and you should take their feelings into account first.
Dude, everyone has seen a gay porn in their lives.
People might have seen gay porn, but that doesn't mean it's okay to laugh at gay people and make jokes at their expense. It's insensitive and immature. Gay people shouldn't be mocked or made fun of because of the sexuality.