Coach tricked the man to have sex with pig by giving him a drug:
Youth 1: How's your man, then, Coach?
Coach: Ah, he'll survive. Wouldn't have been the pig I would have chosen, though.
How does "Wouldn't have been the pig I would have chosen" is related to sex joke?
From my English friend, it means "he were the one having sex with the pig he would have chosen a different one". Coach didn't use the word "sex" anywhere, how is it sex joke on pig?
I find these line in The Gentlemen 2019