husband demanding sex

My husband wants to have sex almost daily. I'm usually not in the mood as I take care of the baby, cook, clean and study during the day, and in the evening I work. Today I was off from work and the baby was taking a nap so I told my husband I'm going to the gym for an hour. This is the first alone hour I get since baby was born 4 months ago. When I came back I started studying for about thirty mins then baby woke up. Then later my husband said "what about spending time with me?? You need to prioritize". He never actually wants to spend time "together" he just wants sex. Because any time we r together, he tries to initiate sex and the moment we are done he's doing his own thing.