So little back story...

My husband is going to be 45 this year and I am 29 will be 30 in January. We have 3 kids. 4 years old (our daughter) 13 year old from previous marriage and 16 year old also from his previous marriage. I have PCOS severely. I have had one miscarriage about a year ago. We both want one more baby. Possibly a boy.

Lately I have just been noticing that our sex just more none existing. We have sex once a week if lucky twice. (Shame me all you want on this) but I have seen his Google history. he masturbates in the shower using porn videos. I haven't told him that I know. However I have told him I don't have a problem with him watching porn yet he denies that he does so. Now we have been having a hard time conceiving ever since I've been diagnosed with PCOS. And he shows no real interest in trying for another baby as he did with our first. We just simply...have sex. We kind of talked about only trying for 2 more years and if it doesn't happen then it doesn't happen, but if it does then it does.

Why do you guys think he tells me he isn't watching porn in the shower and yanking it, when he clearly does? Is there something wrong with me? I'm not pressuring him or asking him to try try try. But it does bother me he is lying and not telling me about watching porn.