I enjoy sex just like I enjoy good movie. What is wrong about it?
Sex(1) is unwholesome(2) according to the Buddha's teaching. 

If one is on this forum just to enjoy oneself then that is probably unwholesome. If the real intention to be on this forum is to learn and/or help people then that is most likely a wholesome intention and is good kamma.

Wanting to be compassionate is a wholesome intention. Not everything we want is unwholesome.

(2) Unwholesome actions lead to suffering. Unwholesome actions are usually entangled with a wrong view of self, nonacceptance of reality and/or not letting go of reality.

(3) Wholesome actions are usually in harmony with acceptance of reality, letting go of reactions to reality  and/or the correct view of self

(1) Why is sex between consenting adult laypeople unwholesome? I don't know precisely but I do have faith in the Buddha's teaching. Even just wanting to exist is also unwholesome, so I wouldn't get my feathers ruffled over it.