I remember seeing an interview with a sex worker once who let the audience on a little secret she found fucking fat guys when they came in.
She said that she had very powerful orgasms in missionary when fucked by fat guys. Maybe it was the pressure on her clitoral cluster or the whole of body pressure.
Just thought it might up your confidence. However an Asian girl complained to me once that I was squashing her...
Maybe it was on "you can't ask that" re sex workers