1) Mention the word 'compressor', ever.
2) Require my heroines to give an opinion about a car (apparently 'it's a car' and, if pushed, 'it's a nice car' are not enough :-)
3) Insist on treating my heroine to a detailed inspection of every car that he might ever buy and a few he will never buy.
3) Ask my heroine to wash his socks...
Okay, enough husband bashing, he knows I love him really and he did have the grace to say "Shall I shut up, am I boring you?" a couple of times as we traipsed around the Geneva Motor show.
It was actually more interesting than I'd thought, with a voice responsive robot that disco danced on command and an impressive simulator and games section.
Plus there were some seriously flash cars and I got to sit in an Aston Martin (which I have given my hero in 'Wanted - An Unconventional Wife') - so it was kind of research...
Sadly any flash alpha males were also cordoned off with the really expensive cars or in the VIP areas so there was no research of that kind to be done ;-)
Any suggestions as to what your heroes will never do?