when making love to a long legged woman, you lay her on her side at edge of bed straddling one leg while wrapping the other leg around your head. allowing full thrust of man standing on ground

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy