Anyone else think it’s not fair?

I’m a woman, and my boyfriend will have sex with me, and then ask me to suck his dick. Obviously the taste of me plus him isn’t amazing, but I know he likes it so I do it. Then one day, their was his cum... somewhere, and I dared him to lick it. He refused and said it was gross while I tried to compare it to what I said earlier in this message. He disagrees. Thoughts?