I have found that Second Life promotes foreign language usage. Because rather than being in separated web sites or spaces you are all in one big space that really is like space, connect and visual, you can communicate on many levels and are likely by sight or social networks rather than a goggle search constrained to a specific language area.
Its strange that they ban nudity since its all virtual reality. I remember when I was a kid girls who took the clothing off their barbies would laugh. I sometimes think the Internet is making this the rule.
An avatar can not have sex on its own. But desire has driven technology and the convention of pink and blue balls has emerged. Generally in a heterosexual sim the man clicks on a blue ball and the woman a pink, yes that is right. The balls then ask for the authority to animate your avatar and if you both say yes then you are jointly animated in to sexual actions. The same holds for dancing.