How to get used to the texture of semen??

I’m be been sexually active for two years and my aversion to the texture of semen has not gone down at all.

I can give oral or handjobs just fine, as long as my SO doesn’t finish in my mouth or on my hand. As soon as semen touches my skin, I gag and can’t stop until I’ve washed it off.

I also can’t watch him ejaculate, because it makes me gag (kind of like watching pimple popping, I really don’t like the gush).

Is there any way that I can desensitize myself so I don’t gag every time? I want to be able to let him finish without having such an un-sexy reaction.