Relationship vs. Hobbies

So since I have started working at a craft store and picked up sewing, it's been my stress relief! The only time I really have to work on any projects is at night after my fiancé has been home for a few hours and our two year old is occupied or going to sleep. We've even gone as far as dropping our daughter off her uncle, aunt and cousins so we can have time to ourselves, and almost always, he expects sex.

He thinks my hobby is more important to him than he is to me, mostly the nooky aspect of our relationship. Although I have no issues when he is doing his own thing, feels like my hobby is causing the problems between us.

I'm not exactly sure how to balance the two out.