My husband and I pretty much have sex every day. Yeah, we take breaks from time to time. I've been through a UTI recently, then he got a yeast infection and then I had a cold
and a nasty period (we usually have sex during my period, but this was was so painful we skipped a day or two of having sex) that we've had a bit of a 2 day hiatus or so.
However, we made up for it last night. *sigh* Heavens, I'd forgotten the absolute frenzy you can get into when you go longer than you are used to without it and finally get into it.
Usually, sex is a once or twice a day thing for us. But, breaks happen. Life gets in the way, and sometimes... you chafe.
Everybody is different. Not everyone wants sex every day, and as long as both partners are happy with the frequency... whatever works for them is wonderful.