Sometimes a couple can be turned off one another simply because they have become too familiar with one another.
It is difficult to feel sexual about a partner if you see them sitting on the loo or shaving their legs!
Some things need to be done in private!
Wear night clothes in bed if you have been in the habit of sleeping in the nude.

Allowing you to think sexually / fantasize is important in creating a sexual appetite, just as looking at pictures of gorgeous food or reading recipes can stimulate the appetite for food.
Your fantasies are your own business, you can share them if you wish but you don't have to.
They can include your partner but it is not compulsory. They may be about friends or famous people - you have complete control of your thoughts or fantasies!

What? Isn't that the point of it all?
Occasionally, during one of your planned intimacy sessions one of you makes the decision that intercourse will not take place.
A full sensual experience can be enjoyed by both parties - full body massages with sensual aromatherapy oils, erotic stimulation of your partner's body by using hands or mouth but no INTERCOURSE. Read up on Tantric Sex.
Orgasm – for both partners can be achieved with no pressure to have vaginal intercourse.
It can be extremely liberating and erotic to be released from the pressure to have intercourse.
It helps couples to understand that there are many other ways to achieve sexual fulfillment and increased eroticism other than intercourse.

Best of Luck!