What level on the IQ scale denotes not being smart enough to consent to sex?

You have less than popular teen girl of 16 with an IQ of 82, it is discovered more popular buy 17.5 years old and co-captain of the basketball team has been coming over before her mother gets home and under the guise of liking her and having her as a ”secret B/F” been boinking her. In the real he has another girl who is his ”public” G/F (yes, he is two-timing both of them and they do not know it). Seeing he doesn’t like his “secret G/F” but she loves him so she thinks, is it rape? Is it just boorish behavior on the part of the teen jock? Does she have to have an IQ below 80 before it is considered rape, or even if she did because she feels she loves him it wouldn’t be? If she was 19 but was the ”secret G/F” or booty call of a 28 year old man would their be a crime if she felt she loved him or not?