Nope, no one should have sex in car. That is bad. Maybe your husband respects and loves you more that's why he has sex with you at home.
My husband told me that he used to have sex with his xwife in his car! With me it's always at home. Does this mean he used to be sexually attracted to her more than me? Or used to love her more than me?
No, I don't think so. They were just younger and a little wild. But now he has matured and treats you like a lady! I think he loves you more than he ever did his ex-wife. Something I have some experience about. Don't worry any, he loves you a lot more. Having sex in a car is kind of childish. He obviously married her for lust and not love. I've been there. He loves you!