I find this word and its derivations somewhat interesting, and kinda amusing, as with many clumsily borrowed loanwords from English.
First off, there is the word «секси». From what I gather, this is an indeclinable adjective... is this correct? Are there any other indeclinable adjectives in Russian? I've never come across any others.
Then we have the word «сексапильный», which I find generally hilarious (it's like saying "sex appeal-ish" in English). Is this a synonym for «секси»? Are there any other words using this root? «сексапильность», perhaps?
Finally, are there any Russian words for sex that are more native than this? Surely you Russians had some words for sex before you stole them from english...