About 77% of girls aged 14 to 19 who had sent a sext reported having had intercourse, compared with 42% of those who hadn’t sexted. For boys, 82% of those who had sexted had had sex, while 46% of non-sexters had done so. The study included teens in the 10th and 11th grades, with an average age of about 16 (the overall age range spanned 14 to 19).