Enjoy the now. While you are swimming in the happy thoughts and memories, things will stay good, but good things don't last.
When the lad starts to get used to the idea that he has regular sex (and good company) then he might start to want more. The question should be, what more will the lad want? To move in? To spend more time with you? To have you and a relationship?
Perhaps the la might want nothing, but it's fair to say that the good times will end at some point..... then what.
Someone quiet rightly mentioned pregnancy. Have you considered the options if you get pregnant? Your answer might not be the same as the lad's answer...so already a diffrence of opinion.
Condoms..... If you start having sex with them, then you can have sex with them, but once you move from condom to flesh, then going back to condoms is a step in the wrong direction. Quality counts. Have you thought about you and this lad going out one night and coming back a bit to drunk, then having sex without a condom? The line is crossed.... the pressure might just be on....someone.
Good sex invokes emotions (we can't ignore that). The feelings of being close and knowing tat the good times shared are being developed. To let go of that is not easy.
From what I can tell (and I am not trying to be critical here) the relationship is based purely on sex. When the novelty of sex starts to die, there is nothing to sustain te friendship or relationship.