Misc: After who was 'decibel' named?

Questions

Whose face has Madonna got tattooed on her bottom?

Which creature did Oliver Reed have tattooed on his genitals?

What is advertised on television as being 'reassuringly expensive'?

Which film featured the characters called Fast Eddie Felson and Minnesota Fats?

Which was the only film actor who was one of The Magnificent Seven and also one of The Dirty Dozen?