Sex life

My sex drive has took a massive dip after pregnancy, I can’t do anything without showering right before hand and I’m just never up for it. It’s becoming a problem in my relationship as my partner believes you need to have sex to keep our relationship strong, he thinks I’m not attracted to him anymore and it’s causing arguements, I am still attracted to him I’m just tired all the time. Anyone else have this problem and what did they do to help it