What is meant by "legal adult," which can be placed on digitalosean?

Immediately apologize for bad English. I wanted to ask. I read in another answer to the question about hosting that can be placed “a legal adult.” But what is a legal adult? More specifically. I have a site with literary works that have no relation to reality. There publish the works of different people, they are written in different genres. There are materials for adults with marks NC-17, NC-21. No pictures, no video. Sometimes (rarely) placed images, but only erotic, not porn, no pictures, it figures (like Japanese manga comics). There are stories in which the characters are minors (again - just invented, no relation to reality, in any case does not promote anything). We do not welcome it, but there are literary works, from which you can not throw it, Nabokov Lolita too minor. Unfortunately, read the full text of all the admin can not, so much remains unseen. There are also fantastic stories in which the hero is a person may engage in sexual relations with different entities such as aliens or with various fantastical creatures such as centaurs, mermaids, etc. Placing such a site on your hosting possible? All of the above fits the definition of “legal adult”?