Oral sex can be much more focused and precise than intercourse. The tongue is much more dextrous and slippery, making it a perfect organ for sex. If you have all that you'll like have a good and long relationship. Yes, I've known a number of paralyzed men who have had very successful sexual relationships.with women, even wives. Remember, sex doesn't occupy THAT much of our waking lives.
Some guys like to have their partners put their scrotum in their mouth and gently hum.
Some guys like you to suck really hard, expanding the head of their penis. Others like it very gentle. Be sure to ask. Gay couples have the added issues of societal stigma and an incredible number of readily available partners, so fidelity enters into the equation. It's slightly possible that some larger fruit, like an apple, could get stuck in there, particularly if you didn't use enough lubrication.