Affair with a horse

A man and his two friends were talking at a bar.
His first friend said, "I think my wife is having sex with the electrician. The other day I came home and found wire cutters under our bed."
His second friend said, "I think my wife is having sex with the plumber. The other day I found a pipe wrench under the bed."
The man said, "That's nothing. I think my wife is having sex with a horse."
Both his friends looked at him in disbelief.
"I'm serious.
His first friend said, "I think my wife is having sex with the electrician. The other day I came home and found wire cutters under our bed."
His second friend said, "I think my wife is having sex with the plumber. The other day I found a pipe wrench under the bed."
The man said, "That's nothing. I think my wife is having sex with a horse."
Both his friends looked at him in disbelief.
"I'm serious.
Spoiler: