the fact that he asked rather than just trying it on shows that he respects that it's something you have to decide when you're ready for it, wait until your sure, if he doesnt want to wait for you it just shows he's not really worth it.
me and my boyfriend had been together for three months when he asked if i was ready to have sex, i told him i wasn't but about two months later, i felt i'd got to know him better and we were properly in love, i felt i was ready, but it was not until another two months after that that we actually did it, we're still together 5 years on so we must've done something rightby waiting!