Summary for the physiology and anatomy of the male genitals.

The male genitals consist of testicles, seminal vesicle, blue neck gland, male mucus and duct system. In addition the male genitals has two major tasks, the first one is to produce sperms and the second is transport it out of the male body.

The testicles produces androgens, which it the male sexual hormones and the most important one is testosteron. The sperm is also produced in the testicles. They are produced in specials cells and it takes up to 10 weeks to develop mature sperms. The production of sperms is a process that is temperature sensitive and the best temperature is a few celsius under the the normal body temperature. The temperature is regulated with the muscle of the scrotum. When its cold the muscle contracts so that the testicles are closer to the body and when it is warm the muscle relaxes so that the testicles comes away from the body and can be coled down by the air. Warm baths and tight pants that keep the testicles too close to the body can reduce the amount of functional sprems.
If sperms leaves the male body and comes inside the female body, they can live up to five days.

SEXUAL INTERCOURCE
The penis consist in urethra and corpus cavernosum that can be filled with blod. This is localized at the top of the corpus cavernosum and that can make the penis stiff.
For the male to perform sexual intercourse and insert sperm into the female genitals the penis must be stiff. And this is when the corpus cavernosum is filled with blod. This happens when the male is sexual stimulated and this consist in affectionate and erotic thoughts, dreams, sight, hearing and smell impressions as well as the touch of the skin.
The male orgasm consists of rhythmic contractions of the musculature of the genitals that are associated with feelings of pleasure.
The purpose of these contractions is to release sperm, also known as ejaculation.
After orgasm, men have a shorter or longer refractory period, which means that it is impossible to induce an erection and orgasm.

REFERENCES
Henriksson, O., & Rasmusson, M. (2018). Fysiologi med relevant anatomi (4th ed.).