Having a nice conversation on the stock market and the military history of Scythia always get me going during sex.
No, but in seriousness, dirty-talk is kind of a hit-or-miss with me. Like, for example, I don't like girls using slang terms like dick, cock, pussy, balls, tits, et cetera. I much prefer penis, vagina, testicles, boobs/breasts. I find it hotter when the girl uses the real words for things, since the slang makes it feel like a safety net to prevent embarrassment. Dirty talk is fine, but I also like sweet, romantic talk more. Feels more personal. Simply talking dirty all the time makes it feel like an act which doesn't do it for me.