First of all even though your a male - no still means no. Relationship or not.

Second of all if she doesn’t want the same as you I feel like that’s okay but maybe she just needs a different partner if it’s make or break. I mean my relationship sucks in the sex department. I’m 24 my boyfriend is 37 - we haven’t had sex in like months so I get super frustrated that my needs aren’t being met. I can’t judge her for her sex drive just like she shouldn’t judge you for yours. But she had to respect your decision of no