When I would be allowed to add something to on going debate as what 3DX identifies;
I would say its not to 100% a sex game, its more likely an adult platform/social platform, after all people come to encounter other and when you not able to communicate properly you not able gain social bonds, if it leads to sexual intercourse or not is a side thing
I stayed long subscribed, even when I was only chatting with people I knew for quite some time. @Gizmoare you and the team even considered a subscription free access to 3DX, with limited options in terms of clothing and sex? Would raise user-count for sure.