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Ariputra, R55Max, and so on, sex in the pen, and you're also scaring people with "400g of blood loss."

I'm not aware of this, but why be afraid of what is natural? If it's not true, disprove it.

"energy loss"

I think that the best way to lose energy doesn't exist. This is called relaxation, in order to gain more energy.

"a man becomes stupid"

And is it unpleasant to be aware of something? We're not presenting our own research, but the research that other people have found.

yes, this is all a specific case of soulless, mechanical sex

Yes, this is a specific case, but it is still partially (to a greater or lesser extent) present in every person. The above is more of a soulless statement in letters about passionate and all sorts of other good adjectives of sex.

for 5 minutes.

Soulless, mechanical sex would continue indefinitely, until the materials involved in this process wear out (which do not relate to a person), and if they (one can imagine human forms of interaction) were eternal, then this would happen forever.
Without a soul, there is no body; a body cannot be soulless; sex (in its generally accepted form) cannot exist without the interaction of bodies; the action called "sex" depends on the interaction between bodies and their souls, and the time interval depends on this and only this.