My husband does not want sex as much.

Hello ladies, I recently got married and its been 8 months. Me and my husband got married and we were in love. He at first was always eager to have sex even when we were dating. The first year was always him wanting to have sex and touch me all the time. With time, it almost feels like I'm always the one wanting sexual intercourse. We have sex every 3 to four days but its usually when Ininitiate. He comes to bed, kisses me, hugs me but does not go any further. He stops and goes to sleep usually turning the other way. Over time, i have been very stressed and concerned. I have tried speaking to him but he complains about sdifferent things every time and finds an excuse. What is the problem here?