Many of the old sex magic systems especially in the west, are rather sexist, based on incorrect biological conclusions, and demonize healthy practices while endorsing unhealthy practices. Especially disturbing in many of these manuals is the demonization of what is characterized as the unnatural build of human bodies, I must speak out loudly against the old recommendations of the circumcision of normal vaginal and penile tissues. But many other inaccurate admonishments against orgasm, ejaculation, and masturbation abound. If one follows a religion where their god has forbidden these things or put restrictions on them, fine, thats your reason, but the various rhetorical acrobatics to justify them biologically are generally proven false and the opposite is usually true.
Perhaps without knowledge of effective birth control methods and proper genital and reproductive hygiene, some of these draconian rules were band-aids to keep bad practices from being even worse in affect. But we do ourselves no favors to continue them.
Orgasms are good for your health (in moderation)
Clitoral hoods, foreskin, and vaginal lips are natural parts of our bodies and are not inherently immoral. It is a simple matter to keep them clean with soap and water and hygienic menstrual period practices using clean cloths