This works equally well with the plumber, electrician, etc. You choose! Your partner, a jack of all trades, rings the bell. You greet this manly figure in your new satin nightdress and let him in. You flirt a bit while he rummages through his toolbox. Ideally, draw this part out for a while. Then, when your repairman actually starts to 'repair' something, you lean over him, brushing past him with the narrowest of margins... an essential step for increasing levels of arousal.
Why's it so hot?
The surprise, unexpected encounter. It's an "I like you, you like me, let's get on with it" kind of situation. Often, this experience turns out to be much more exciting in role playing situations than in real life!