furnace, heat, etc.

I opened up my spam filter just now, as I do every few days to check for real messages that went astray, and found this subject line: "Give her furnace some heat". It claims to be a pharmaceutical company sending the message, and of course I didn't even try to open it. But wow, "give her furnace some heat" is the least hot metaphor for sex ever, with its imagery of shovels and hods and coal. Maybe the spammer is a huge fan of Busman's Honeymoon, and after giving the furnace some heat, the man goes out to be washed under the pump like a puppy!