Aptoide claims to have scanned the apps for virus or malware infections. Or magazines you had to ask people to get behind the counter. Planet Pron is a high end porn app with a lot of good content. It's probably the best app store specifically for porn apps and porn games. Aptoide itself is free and most of the porn apps are free as well. There was a bunch of different types of content so it should suit most types of people.
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You can find cartoon and hentai stuff or live-action stuff if you prefer. Just be cautious because some unruly stuff does get posted there occasionally like The Fappening. Reddit is a surprisingly good place to find good adult content.