With cloth on, it is almost impossible to know. Naked, it will stand straight up.
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One way to know if a boy has an erection is if his penis becomes larger, firmer, and stands out from his body. Erections can occur due to physical or psychological arousal, such as sexual thoughts or stimulation. It's important to respect privacy and boundaries regarding this topic.
It is possible for a boy to get an erection from hugging a girl if he feels sexually aroused or excited during the interaction. Erections can be influenced by a variety of physical and emotional factors, including attraction and arousal.
The scientific term for an erection is "penile erection." It refers to the physiological process where the penis becomes enlarged and firm due to increased blood flow into the erectile tissues.
Sexual arousal or physical response does not determine sexual orientation. If you are attracted to boys, regardless of whether or not they sit on your lap, you may identify as gay. It's important to explore your feelings and attractions in a way that feels comfortable and authentic to you.
An erection is a complex physiological process that involves the nervous system, blood vessels, and hormones. When a man becomes sexually aroused, the brain sends signals to the nerves in the penis, causing the blood vessels to relax and widen. This allows more blood to flow into the penis, filling the spongy tissue called the corpora cavernosa. As the tissue fills with blood, the penis becomes erect and hard. To maintain the erection, the blood vessels constrict to trap the blood in the penis, and the nerves release chemicals that help sustain the erection. After ejaculation or when sexual arousal decreases, the blood flows out of the penis, and the erection subsides.
Erections are a normal physiological response that can occur in boys at any age, including around 10 years old due to hormonal changes. It doesn't necessarily mean the boy is thinking about anything inappropriate. It's a natural part of development and usually nothing to worry about.