Getting nudes isn't getting laid. Get her on a date instead so you both can see it all in person. People do all sorts of things with nudes and dick pics. This could very well be a man wanting to jerk off to your cock. Men do these things to men. Keep yourself safe. Sexting isn't sex. You get sex from dates. Go for dates, not sexting. The less time you spend sexting and more time going on dates, the more you're actually gonna have sex with girls.
If they are super insistent on sexting they are probably not even a woman and it's a man trying to catfish you.
Make sure you verify that she's real by either calling on the phone, getting on snapchat, or something else.
