This site is nothing like Pirate Bay for example where you'd have to choose extremely wisely before picking something for fear of it having a virus of any sort. Because for many, modding on this site is their income, is their reputation, and is their business. While there is a chance there is a mod where there's something malicious, the site detects this, also, mod creators don't want to be phishing and other things of that nature to their community members. a mod tagged as 'Combat,' 'ENB,' While others may be tagged as, 'Nudity,' 'Adult Content.'
While people may lie about their age when making an account, there are tags in the site that differentiate mods from one another.
Usually, these mods are only able to be viewed when the user has an active account. Regarding the incidental nudity, there are mods of course on Nexus that are for more mature viewers. However, there are certain mods that haven't been checked of course, but, it tells you it's at your own risk. The site itself usually has files checked by people to make sure they're not contained with anything malicious. This site is used for adding mods to games.