Don't perform it then
Or try to do it and try to find something positive about it
Are you girl or guy? If you are a girl you can try but not do it till the end, don't let him ejaculate in your mouth, don't let him hold your head and don't let him pump into your mouth. And use your hand a lot.
Just play with it and lick it and suck the tip - it's not that bad at all.