Sex is great, especially when it's with someone you care about. What's more important is having consent before getting it on. If you get rejected and are left hanging, just remember, would you want to be forced to drink a cup of tea?

You surely wouldn't want some to shove tea down your throat if you don't want tea. You surely don't want someone to pour tea in your mouth while your asleep or unconscious.  If you want tea, awesome! If you change your mind about tea, sure it'll be annoying because someone went through the trouble to make you tea, but it's fine, it's your choice to not have tea.

Same applies for sex.