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.
Are there no mandatory service in the USA?
No. Men between 18 and 25 have to register with the government, but that’s it:
https://en.m.wikipedia.org/wiki/Selective_Service_System
On top of criminal punishments for not registering, you also won’t receive any federal assistance for college, employment, loans, etc.