Sometimes me and my girlfriend hold off for a long time if something is coming up soon (other than my dick), for example on our birthday we were getting a hotel room in London, so we held off for a few weeks to make the night a bit more special.
I say it up to the people in the situation and no one else. But I know my g/f had a hard time when i told her no to sex for like a month for some reason or another (it was a while ago) so some people just don't do it.
If I love her enough to want to spend my life with her, and this is something that is very important to her, yes, I would do it. Err, rather, I mean I would not do it.