Before you are tempted to do something risky -- like leave your stable, good relationship for your exciting emotional lover -- it's important to examine what's really going on. There's a huge difference between a platonic friendship and a friendship that has crossed the line into the emotional sex danger zone.
Some types of cancer and their treatment affect your ability or desire to have sex more than others.
If you are in a loving relationship your concerns may be different from someone who is single.
There is considerable diversity among the asexual community; each asexual person experiences things like relationships, attraction, and arousal somewhat differently.
In a usually pejorative sense, and especially applied to women, the word frigid (sometimes just cold) is used.
An asexual is someone who does not experience sexual attraction.