I like to be in one of:
Spread eagle
Standing with arms tied above head (I have super ticklish sides and armpits)
For something a bit kinkier:
On my knees with my head on the ground. Feet spread and wrists tied to my ankles, so that my ass is up in the air and exposed, and my cock and balls are hanging vulnerably between my legs. This lets the ler at my ticklish balls, taint and hole, and also let’s them spank me or wank me 😉