LIFE, is the ever changing events that effect us all differently and in turn our preception becomes our reality. The orchestra that we listen to in our brain, paints the picture with which we live our life. The things that we want, come to us. When we present with low level energy, the things we do not want, can find their way into your life. No where is this more true, than with LOVE.
It gives us things that we can't see. I releases brain chemicals that put us into a great state. It symbiatic relationship with someone else is even more profound. Two people are able resonate off of each other. To share with one another, how they are feeling by the way they are being treated.
This erotism is the same if not better then nutrition. In some ways very similar (especially on a chemical level) to the process that anything that effects our body has to go through. Our bodies, quickly figures out, how to get energy from what we are doing. This energy can then be used to provide the energy for many movements, muscularly and neurologically.
When erotism does this, then our sources, or our energy is coming from something else, and ultimately from our selves.