Help a girl out!

I'm 20 and my so is 21 and the sex is incredibly boring and I NEVER FINISH. we used to be all over each other up until i gave birth. (Bub was a big time crier) so our relationship was a bit strained like most parents but we were 19. He never lasts long and the sex is dull how do I spice things up? We have some affection issues that are being addressed at the moment (thank God my MIL stands up for me) as he gives me like 2 kisses per day and thinks it's OK. We have sex on a good week maybe twice? Basically I need ideas on how to spice things up! And how to get him to last longer and for me to finish!!