Wouldn't Touch With Yours Meaning

(idiomatic, transitive) To not find (someone) sexually attractive; to not have sex with someone.

Example: 1965, Hunter Davies, Here we go, round the mulberry bush
  Her bottom lip hung down practically to her navel, wherever that is.
  "Do you mind," said Spike. "Even with a sack over her head and the Kohinoor diamond stuck at the end I wouldn't touch her with yours."