Porn&Masturbation VS hooking up with random Girls/FwB
As you said yourself, masturbation destroys your soul. That’s a reality many men face.
Most religions and spiritual traditions know this and therefore recommend not to masturbate. As a catholic Christian I grew up, knowing it’s a sin, experienced it as such as a porn addict. On a more eastern understanding, your wasting life force. Your body need huge amounts of energy/ nutrients to replace the semen. And if your hooked on porn, you ejaculate usually much more often than a normal guy from sexual intercourse.
On a more medical point of view, we know that Porn, Masturbation and Orgasm (PMO) are just as addictive as cocaine. The changes in the brain are astonishingly similar.
Casual Sex on the other side has other downsides. Firstly, you waste your semen as well.
Secondly, I know enough cases were at least one sided startet to feel something for the “Friend” even it was never an intention. Thirdly, you can base this on neurology or energetic practices like yoga/ tantra, that whenever you sleep with someone there’s an exchange of energy. Since sex is originally focused on procreation that makes a lot of sense. During sex, your brain segregates Oxytocin and the pheromones of your partner are copied into your system. That way her scent triggers emotions in you. On a more esoteric point of view, your energies mix and stay within the chakra of your partner and vice versa. But you’re not only connecting to her energies but also to those left by her other lovers.
So it always has its cost to sleep with random people.
Statistically, happy couples have much more and better sex than singles with lots of FwB.
Sex has everything to do with trust. Trust doesn’t come through casual sex. It needs time.
Some people say that the sex turns boring after some years, but that’s their problem. If your open to learn about your partner, his passions and kinks, sex tends to get better and better over time, provided both work constantly on the relationship.