In a long term relationship its probably hard to generalise. Speaking from experience in relationships it usually worked out to be based on the the position I found myself. So in one relationship I was bottom 90% of the time but still felt the urge to climb on top and reciprocate., enjoyed by both parties. My longest relationship I was top 99% of the time as he hardily ever wanted to top me, which worked well as we knew where we were and were comfortable with this, and, when I was upended and mounted an unexpected thrill for us both..
Many times though, while on the "free lance" field its been get to bed and find out what's expected, which adds to the sexual fun and adventure.