Talking about sex, about genitals, about porns etc
Those are boring buddy. Start roleplaying. Like " Lemme pull you closer and taste your juicy lips baby.. I'm sucking your upper lips while my hands search for your sexy soft boobs.. " kind of.. start sharing sex gifs pics, videos, do video calls, audio sex, masturbate mutually while you talk..
That's cool dude, but if we want to limited only texting?
Then gifs are a great way to turn her on buddy. Use words and gif togather. Like say " I wanna rub my dick on your pussy like this baby" and send her the gif. Also make her to say what she would do. Try to speak in your local language. That's much hotter
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Using direct words..(dick, vagina, boobs etc) can also destroy all interests in it..