Well, "love is spiritual and sex is biological" can be true to some extent. But it has happened a lot in history that through spiritual development people can develop their sexuality. All physical things can be controlled through spiritual development. Through meditation, deep thought or by other means one can reach the proper way of their subconscious mind or can get coincidence. These are signals to the mind and body to follow a particular way. Then if one can follow his biological change will follow. Now, what is this? is it spiritual or biological?

First strong sexual desires or sexual strength doesn't necessarily mean that one is biologically superior. it is not so cause it has also been encountered a lot that female desires for sexual concerns are much higher then male. Physically males are stronger then females because of genetics.

With that interpretation we cannot say that women are sexaully inferior then men or men are not spiritually superior since spirituality is one of the controlling device of the body.