My bf gives me money, is he paying me for sex?

My bf is 9 years older than me, has a job and I'm a student. We don't see each other often. He almost always gives me money. It started after some dates. But I notice he gives me less money if we just hang out to have lunch or dinner compared to if we hang out then have sex. The first time he did this he told me he's not paying me for sex but because I'm a student and he works plus he kinda encouraged me to quit my part time job. But the fact that he gives me less money when we don't have sex makes me wonder if he does pay me for sex. What do you think?
My bf gives me money, is he paying me for sex?
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