Sexting without photos

I'm 15 and almost 16. Last year when I was 14, I was sexting a guy the same age as me. And I didn't send full nudes, I was just in my underwear. My parents caught me, I got grounded for 3 months with no technology and nothing other then school. I've learnt my lesson I guess, but more than a year later, I have a boyfriend I love with all my heart, we are very close, he's the sweetest guy I've ever met, we've been together for 10 months in three days, I want to spend as long as possible with him. So what I'm saying is that we are serious, and I want to sext him.  So I was wondering if it's illegal for someone under 18 years of age, to sext without images (just talking dirty.) ???