I get a bad groin cramp when I sneeze, no joke. It only started happening when I got on test.
If I have a boner and I sneeze if feels like the tip of my cak is going to blow clean off, sort of like a champagne cork.
Solution I try not to sneeze, especially when I have a boner don't want to pop the cork off.
Solution for you, as above stop having sex, give little willy a break.