1) Non-penetrative sex using knickers.

When the lady hasn't taken her knickers off and sex is still attempted through the knickers. It's a confusing mix of knickers, bollocks and goodness knows what else.

Some people try this as a contraceptive method.

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