Did Raoul die a virgin?

Why would you think that

Does it really matter? There are worse things than dying a virgin

Given how Athos raised him to be the most valiant of valiant knights and most honourable person in existence, he certainly died a virgin. This was not necessarily obvious in the film, but Dumas' original story shows it very clearly.

He was french so most likely had some gay expediences before he died

Considering his background and character, I'd say-yes!

Wasn't it standard to wait until after marriage in those days?

Either way, it doesn't really make any difference to the plot.