embarrassed by sex?

Kate
My husband is embarrassed by sex. We don't have sex all that often, he gets anxious and insecure. I find him so attractive and I tell him this, I try to show him this. 
Every few weeks (because I don't want to push it) I try to seduce him, and I get rejected. 
Every so often I notice he's watched porn on his phone. Not too often though. 
My question I guess is, does anyone have any advice to show him how great he is as not only my husband but as a human being, and how great he is at oral and sex too?? 
I don't know what to try to be honest. I've tried to google it but there's not much out there.