Sex on work days

I don't know if I'm the only one who feels this way but on days that I have to work I don't really want to gave sex. I work 4 days a week Mon thru Thurs and I work long hrs 10 to 13 hr days. When I come home relax and shower all I wanna do is go to bed. My husband wants sex almost every day. I'm cool with Mon Thurs and the weekends I'll compromise. It bothers him because he works hard Monday through Friday and still wants sex and has the energy for it every day. What's wrong with me? Am I selfish? Should I just have sex any time of the week even though I'm tired or not in the mood for it 😕