In a majority of episodes, 2 men are seen performing sexual acts and intercourse (No genitals are shown in the whole series)

A character writes novels based on his lover and another man he used to love. The content mentioned contains romantic and sexual themes, with his lover being angry at him for writing "peverted" novels about him (and previously his brother.)

This is a yaoi. Male characters frequently are seen doing sexual acts and kissing.

Words like "bastard", "shit", "piss", "crap", "screwed".

Characters drink socially.

One main character is almost always seen smoking cigarettes.

In the manga, it's more specific about the sex scenes. It shows that it is consensual, but in this anime it seems as if one character is taking advantage of the other

There are rape scenes. They are not insanely graphic though since they show no genitals or gore but don't watch this show if your sensitive to stuff like that