How do I tell someone I don't like oral sex?

So for some reason I don't really get any pleasure from receiving oral sex (no, I don't need advice on how to enjoy oral sex or reasons why I might not enjoy it) In my last relationship my bf hated doing it anyways so didn't expect anything in return.

When i do receive oral sex I fake it because I don't know how to tell them not to without ruining the moment. Now I'm in a position where I've been on two tinder dates with this guy and we will most likely have sex the next time we see each other.

how can I tell him I don't want to receive oral sex. I wouldn't mind giving him a BJ but I wouldn't want him to expect it all the time.