As they started to realize their feelings of attraction for other men a sinister thread started to weave it's way into their minds.
Whoever it was that was making the changes to their desires was also pushing them to be attracted to that person that was most repugnant to their own personal sensibilities. These men they became attracted to weren't ugly, per-say, but were the men they would have made fun of, turned away from, or drew out in them that quality that made them desire to be the jocks that they were.
Furry, fat, twink, dominant, submissive, were all parts of their horror and part of their new desire.
Try as the might they could not resist these new desires. They were forced to live out their horror and deep inside their minds they knew they were repulsed by what they were doing.