Every woman is different. That's part of the magic. I actually like both types you mention.  Heavy women...no...very tall and slender with smallish boobs...no.  Athlectic or soft & curvy...absolutely.

Tight Curves

Curves - Yes!  A woman's body has curves.
Athletic - Yes!  A healthy body is a sexy body.  

The hottest body I ever encountered - she had an ass like volleyball and it felt like I could bounce a quarter off of it, but she was still a woman, soft in all the right places.  She had curves everywhere.  Tight perfect curves, like they were drawn by an artist, a Da Vinci, with a protractor and compass.  Tight mean curves you'd need a sports car to handle then fade away into soft slopes to get lost in.  

I never got to see her again.  Her memory haunts me to this day.  When I'm elderly and my memory starts to go, I hope I'll still remember her and smile.  

Just my 2 cents.

I MUCH prefer the athletic body.  My primary is hella-fit and that a big part of it.  

I don't care for the soft...and frankly, I can skip it and save my money for multiple hours with what I DO!!!! want.

...."soft body" types are welcomed as sexy is sexy!!!  However, I do lean toward the more athletic build.

I've even had sessions with full blown Female Body Builders........the experience can be very sexy and sensual!!!