Sorry aber short hair on women does it for me.

Necks

They are so sensitive. Try this at home. Consenting adults only.

Blow gently on her neck and she'll feel cold. A few goosebumps maybe? That's sexy on it's own..

but

Breath out on her neck and she'll feel heat.

See - the old adage of "Blowing Hot & Cold" really does have roots in realty.