Sexual instinct is able to change the course of thoughts. As simple as that. I noticed it clearly today when a surge of hormones in the bloodstream (natural surge, I'm not taking anything) spawned lusty thoughts in my mind out of nowhere.
I wonder about the monks, probably most of them have naturally low levels of blood testosterone, whereas some of'em may have applied brute force and cruelty towards one's body.
I agree that sacred sexuality is a means to spiritualize otherwise lusty thoughts.
This is an ongoing issue i have dealt with all my life and still do not have the answers. Although i am coming to some understanding. i thought i would respond to your text rather then go into a long talk.
Each of us has our own individual way of dealing with our sexuality and 'surge of hormones' as you describe it; Some more moral and some less and often that approach is often dictated by what means we have of release or sexual transmutation from our environment and from within. Being around monks and nuns most of my life i have also seen many of them leave the monastic life because of this issue.
i also have found that the sex instinct has changed the course of my thoughts dramatically and i have a much different look at life and people because of those thoughts. i would say that i have become much much more tolerant over the years and have recognized that morality can be very different for people based on their instinct and spiritual approach to life. Some of these insights may be more prevalent for you as well since you are experiencing a Jupiter transit to your 8th house of sexuality and values held with other people as well as a Pluto transit to your natal Saturn in the first house this transit alone is quite a factor in changing our attitudes about self an our inhibitions.
i think of you often while practicing looking at the spiritual eye. i am sure this is a helpful factor in redirection of energies. God gave us quite a mountain of natural instincts to overcome when we were put in these human forms. Let us be kind to ourselves as we find our way back from where we came.
Jitendra