OLDER ONE-SHOT, BLAIR IN A STAIRWELL LECTURING ON ANAL SEX
I believe the background is that Blair, working at the police station, has been facing some anti-gay harassment. Jim tries to keep an ear/eye on Blair because he is worried that it will move from verbal to physical. One day Blair takes the stairs and is followed by one of the worst of the harassers. Jim follows, but not close enough to be seen by either of them, and instead of having to intervene in an unpleasant situation, Jim overhears an unexpected conversation. The harasser gets Blair's attention with an offesive comment, but Blair instead of getting upset, acts as if the harasser is innocently unaware of what he is talking about and turns it into a lecture along the lines of "your prostate is your friend", and I think there is the metaphor that the human body is a playground and limiting oneself to heterosexual experiences is the equivalent of only using the swings and ignoring the rest of the play equipment. Jim ends up not making his presence known during the conversation (which I recall as being quite funny, as Blair's 'educational' reaction totally derails the harasser's intent to make Blair uncomfortable) and the confrontation ends with no negative outcome. Later Jim teases Blair about some of the wording Blair had used.