This is purely individual, but there are generally accepted norms, in case of deviation from which, you must contact a medical institution.
After reading this material, you should not have any questions about penile arousal - erection. Monitor your health and do not hesitate to see a doctor. Help your friends by sharing this article with them.
In order to have sex, a man's penis must be firm. The increase in volume and hardening of the phallus - this is the answer to the question "what is an erection."
Erection is associated with physical parameters, psychological and emotional mood. If a man is depressed or anxious, disgusted or fearful, an erection may not occur. It is worth noting that in the period from 5 to 13 years, boys may experience spontaneous erections.
This is very embarrassing for many teenagers, as it happens at school, in the course of playing with peers, in the shower.
physical stimulation - a man touches a woman (or vice versa); visual stimulation - a man sees (on a TV screen or in a picture) or presents a woman naked. This is one of the reasons why the majority of consumers of pornographic products are men.