After watching "Permission to Escape, Sir" (the only episode that directly involves Carter's relationship with a woman, as mentioned here
), I'm left with a different impression of Carter's mentality towards women and sexual attraction as a whole. Unfortunately, this doesn't really clear up the matter of his actual sexuality.( More of me taking media analysis a bit too far. )
Also, Klink could not be more slashy with Hogan if he tried, and I'm not completely convinced he isn't. He gets depressed in the middle of the night and what does he do? He goes down to the barracks, wakes up Hogan, and mentions that he was feeling upset and wants to talk to him, colonel to colonel. Then they go to Hogan's room, he sits on the bed and mournfully pours out that he knows he's a failure and he hates it and the expression on his face is practically begging
for a hug. Hogan mostly snarks at him about it, because I'm pretty sure he's a lady's man to the end and is a bit uncomfortable with the situation, but it's still so cute it hurts.