Yeah, I took about a year off of sex when I was 20-21. Dated a few guys during that time, but never really found one I wanted to do the mattress mambo with, so I just didn't. Then I got together with a fuck buddy for a while...then I met E. and ditched the fb.
Since then, I've never really been on sabbatical. There were a couple weeks without sex after I had my IUD inserted, simply because having sex would cause these terrible cramps, and there have been a couple times where we've not had any sex during the workweek because we've both been so busy/exhausted, but I think that's pretty normal.