In regards to the word "seke" (from the seme/uke thing), isn't is "suke?" I always wondered. :P
Pointless reply is pointless, but the reason it's seke and not suke is how the words are broken up. In japanese seme is せめ (せ = se め = me). And Uke is うけ (う = u け = ke). So for the Japanese speaker to split it up into s + uke would be near impossible- as s isn't a stand alone consonant in the Japanese language. So they just take the first kana part of seme (せ se) and the latter of uke (け ke) to make seke! (Though, if you're ever speaking with a japanese-born yaoi fan they may sometimes forgo the word seke in favor of the phrase Riba (リバ). It means the same thing, riba is just slang for the English loanword "reversible.")