We dont have enough SEX

I love my boyfriend and we have been together 12 years. We havent used contreception in 10.

We have been 'trying' for about 2 years by charting and doing opks, prenatal vitamins, metformin etc but we just dont have sex enough!!!

I understand he isnt going to be as horny as he was in his 20's but feel like having sex once a week (if im lucky) isnt going to get us a baby..

If i have a positive opk we have sec that night ..cos i tell him we have to but thats it..

Being knackered, stressed etc just gets in our way :(