This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
Social beings like approval of peers.
Like another commenter said, survival instinct.
Also its a nod to our identity, we derive a sense of self worth from those around us. Approval from people who believe what you do makes you feel like youre a part of smth bigger than yourself (look at religion, nationalism etc).