Sexual arousal comes primarily through the five senses. Below is a detailed description of the mediums:

1) How excitement comes through the eyes:

Seeing something that causes lust in the mind and body; But it is different from person to person. For some people, the penis becomes hard when they see something slightly provocative, while many porn movies, sex with women, and even drugs do not make the penis hard!

2) How excitement comes through touch:

As many see or think, the coldness of the sex does not go away; However, touch works great. Here the impulses are transmitted to the brain and body through the nerves.

3) How the excitation comes through the ear or auditory power:

Many people get very excited after hearing sexually suggestive words or stories. Many people get excited by hearing the description of different parts of women, and also by hearing the voice of a woman.

4) How the arousal comes through the nose or sense of smell:

Some fragrances arouse lust in many. Again, the fragrance of the female body can create many people’s desire.
5) How excitement comes through the brain:
Sex is aroused through sexually arousing thoughts or fantasies. Imagining different parts of the body can also create excitement.
These are all normal; However, there are many exceptions. In some cases it is normal or in many cases abnormal or perverted. But for those who have extensive physical problems, it does not create tension in any way.