I've eaten pussy, I've sucked dick. Both hurts after a while, or hurts if you're doing an especially good job. I think girls have it harder in different ways, (think of how it feels to hold your mouth open at the dentist for an extremely long time, then add in sucking, licking, massaging, and jerking) and guys have it hard as well, because well..us women are known to take a little while and there's a lot of mouth action as well.

NO ONE should HAVE to continue going but it's nice if you do

anyway, carry on.