Your argument is sound.
Robert Monroe claimed that while he was investigating other dimensions, he saw what first appeared to be mounds of writhing worms. When he grew
closer, he discovered these mounds to consist of naked, orgiastic ex-humans, frantically, desperately seeking sexual satisfaction. He claimed a large
proportion of these had been nuns and clergymen who had denied their bodies' sexual needs while alive. Thought provoking.
Sex for lust fulfillment is of the body so surely is not of spiritual concern
Well, to be remembered is that many cults/religions believe that sex is a vital and empowering element within their rituals. (ala Crowley, La Vey,
'Dracula', 'satanism', etc.)
We're told many ancient religions placed a high premium on virgins (and some still do).
Science can stimulate orgasm and can demonstrate it on graphs, but a written or spoken description falls short of the real thing. So perhaps the true
spark involves more than the physical body? Many might say this is definitely so.
Then there's Tantric Sex. Not of 'spiritual' concern ?
I believe there is a spiritual element within sex. Not always. But once experienced, the spiritual element cannot be denied. It's effects can be
profound.
So ...... it may be that MOST often, sex is just sex. And it may be that sex with a prostitute is entirely physical. Most of the time. But not
always.
After all, sex is responsible for the birth of a new soul.
Not just a new body. A soul.
How does a soul commence ...... a divine spark?
Divine? That's beginning to sound a bit spiritual isn't it.
So we have a combination of sex and creation of a soul.
I'd say sex and spirituality are therefore forever bound.