Can brainwashing and justification overcome disgust?

I was just thinking about something..
In the past
It is said that communist spy training centers created gay operatives
Since the vast majority of men have a natural aversion to same-sex contact
Even with training and telling oneself "I can do this," is it actually possible to overcome and sublimate this feeling of disgust?
Of course, it is said that past communist states used brainwashing and justification to turn operatives who felt disgust into actual gay men
And that they even claimed to have trained them effectively; how was this even possible??