As a man, sex is an incredibly difficult pastime to enjoy. This is because a man is always expected to perform. The effort required to pleasure one’s partner to the level expected is often underestimated, and that effort often takes away much of the joy experienced in the act. Further to this, this expectation, as a man, is necessary to be met, because your worth as a human being is often measured by your sexual prowess.
If you don’t perform to the expected level, the person you’re having sex with will often judge you, and potentially tell others how disappointing you were. This problem is actually worsened when a man is chirpsing/seeing/in regular contact with his sexual partner, because there is an added sense of responsibility put upon him. As a man, I believe it is incredibly difficult to have a relaxing shag due to this constant pressure to perform.
But it gets worse! Indeed, for the reason stated above, many men end up avoiding sex with their sexual partner - the high bar he is expected to meet puts him off. But, in this case, his problems multiply, as his sexual partner often acts as if they are owed this sexual attention. His partner often takes it as some kind of personal insult, and this either weakens the relationship, or leads to the man being pressurised into a sexual act he doesn’t want to enter into.