8. Say “I don’t want to have sex unless I really like that person.”
“I wouldn’t be friends with people who wouldn’t give up after I say this.” You’re friends for a reason and one of the reasons is because he respects you and your opinions. You can reaffirm this and say things like, “There’s not much point in having sex if both parties don’t like each other, am I wrong?” and he should understand you’re not interested.