Why do girls always jack off boys

I've noticed this trend where girls have been conditioned to give out dildo rides, go down on boys whenever they want, etc. but do not expect any sexual reciprocation. <br><br>Or you'll just get jacked off and left to finish yourself off. <br><br>It's so sexist. I've heard so many stories of girls pleasuring their partners until they finish and then they don't get any pleasure and that's OK.