Three men in a pub

Scott, Tones and Mathias went down to the pub for a pie and a few beers. After a couple of rounds Tones announced he thought his wife might be having an affair with an electrician because he’d found a pair of wire cutters under their bed and they weren’t his. After another round Mathias confided he thought his wife might be having an affair with a plumber because he had found a strange wrench under their bed. Then Scott exclaimed “Well that explains it then!!!” “Explains what?” they enquired.
“Well I came home the other night and there was a jockey under the bed…. She must be having an affair with a horse.” announced Scott.