Hey, this is a great question and something I have managed to avoid throughout my relationships. I have been ultra-aware of this and it was always considered by me to be one of the greatest disappointments in the game of love. The one and only remedy that has always worked for me is SPACE. Literally. When I move in with the person I am in love with, dating.... I always have my own bedroom and he has his. I have always been met with great resistance or hurt feelings first, but when they see that doesn't mean we don't sleep in the same bed together, it becomes sexy, refreshing, exciting. Some nights we are in my space, sometimes him, then some nights he has his own space and I have mine. It makes a huge difference. Also, I try not to talk about with my boyfriend, in that he is not one of my "girlfriends". Meaning, I let him be a man, I'm not going to talk to him about every single detail about my life, I always let their be a mystery to me. Sometimes couples talk too much, I say take the talking into the bedroom so to speak. With no words. One last thing, I absolutely always without a doubt get up and get dressed and take care of myself. It takes a lot of effort not to just put those pajamas or comfy sweats on, it's easy to to do that and get comfortable. I always want to be sexy for him. I want his attraction. I work at it. To be honest the most important way to kill the dead bedroom is to HAVE separate bedrooms. It's been keeping my relationships alive since day 1.
Sean P. Diddy Combs was once asked what is the secret to a successful relationship and he had a great answer. " I do 2 things. Keep is FRESH and SEXY". Absolutely NEVER get comfortable. Once you're comfortable it's over.
There's also a great movie that perfectly depicts the end of that type of fresh and sexy relationship. It's called "Blue Velvet". Ryan Gosling and Michelle Williams. Everything is exciting and promising, as with every new relationship. But over time, after a kid, a shitty job, age, bills, it becomes Blue Velvet.
It's possible to avoid Blue Velvet. I do.