A relationship therapist breaks down the 5 most common problems couples have in bed

• Once you enter a serious relationship, sex can get complicated.
• We asked Rachel Sussman, a NYC-based marriage counselor, about the most common problem couples have in the bedroom.
• Those problems include sexlessness and one partner being resistant to the others' fantasies.

Sometimes, getting into a serious relationship means that sex becomes less, well, sexy. Both people are busy and there's no time to do it. One person would rather have a glass of wine and watch "This Is Us." It's gotten boring.

These aren't reasons to be ashamed - you're hardly alone in your plight and there are plenty of potential solutions out there.

I recently spoke to Rachel Sussman, a relationship expert and marriage counselor in New York City, about the most common problems couples encounter related to physical intimacy, and her typical approach to helping them. Read on to see what's really going down in your friends' bedrooms.