The marriage bliss stays for a few months during which the partners are highly intimate, and their bond is strong. This stage stays on for a few month and after that, with work, family and other pressures, people get tired when reaching home and there is just no energy left for intimacy.
All you wish to do is snuggle into your comfortable bed and have a sound sleep. For a marriage relationship to stay put, physical intimacy is as important as how much you share your life with the partner.
This video gives a list of things you can have and do to increase your sexual energy. Go through the video and enjoy a blissful relationship.