Ttc baby 3

So me and my husband of 16 years have been trying to conceive baby number 3 for the past 6 years with absolutely no joy what so ever. But I think I know the problem, everyone including doctors have said it's best to have sex every other day to make sure sperm is good and strong but even after 16 years our sex life is on fire some night twice a night and it's absolutely amazing every time. So the thought of no sex in any night is very daunting but we have decided to give it a try over the next couple of months. Wish us look xx