an ultimate expression of love is sex.
LOL, where did you get that idea?
Sex is for reproduction.
Love is expressed by sharing intimacy which may include sex but so much, much more.
Try actually reading into the Kama Sutra instead of just looking at the different sexual positions.
The Kama Sutra is an ancient Indian Sanskrit text on sexuality, eroticism and emotional fulfillment in life.
Look into tantric expression
Tantric Love Involves Your Whole Body
Your energy moves from your genitals to the rest of your body. Any part of your body can experience pleasure during the act of Tantric love. In addition to the body, Tantric love also involves your mind and your spirit.
I describe love as a connection with someone in body, mind and soul.
Its a two way connection or it isn't love.