To me, the depiction of same-sex intercourse (here, between two men) becomes porn when the feelings are gone. When two characters do not have feelings for each other, their sexual encounters should be based on mutual respect and this should show by there not being a struggle for sexual domination and a desire to submit one character to sexual practices that he does not want to take part in. When two characters do have feelings for each other, there needs to be some emotion shown (it doesn't have to be "I love yous" all over the place) during intercourse.
The moment respect is lost is when you cross the line into pornography and God knows the LGBTQ2+ community doesn't need any more caricaturing or objectification. They've got it bad already.