Life seems but a quick succession of busy nothings

Because my f-list knows the answers to Important Questions:

a) What is the female equivalent of a "Lord Mayor"? Is she a "lady" or a "mayoress" or neither or both?

b) In your opinion: when did lube become an every-day product that can be bought in your friendly neighbourhood drugstore? I read "Life on Mars" slash occasionally, and whenever I encounter the casual mention of lube in the nightstand drawer, it strikes me as somewhat off. Wouldn't vaseline be more likely? I've honestly no idea - I can be dead wrong here. I just remember that when I was in my teens in the 1990s, it was "vaseline" that was associated with anal sex, because "lube" wasn't around all that much and could be only purchased in the rather more, ah, specialised shops. (When I was 17, I read about the use of Crisco as the product for anal fisting in a gay mag, and my then best friend and I bought some in a sex shop and used it to bake a cherry cake. We thought it was hilarious. But that's just by the bye.)

I wrote a Dudley/Aunt Marge fic last night. Before you run off, screaming with disgust: It's only PG-13. No graphic action. After all, Dudley is only ten.

And that brings me to my question: How would a 10-years-old Dudley Dursley refer to his penis? I bet Petunia and Vernon are not very articulate on the subject of sex, and I've no idea how advanced sex ed classes are at a school Dudley is likely to go to. How much is he likely to know on the matter of sex? And how would he refer to breasts?

Yes, I'm taking the project seriously.

ETA: Just because it amuses me: I've just consulted my slang dictionary and found a plethora of slang expressions and euphemisms for 'penis' from throughout the ages: red-cap (Lupin's DADA lessons appear in an entirely different light), dribbling dart of love, lamp of life, flip-flap, marrow-bone-and-cleaver, nooney, lucy, tantrum (rather appropriate for Dudley), thingamabob, yum-yum, dork (adds a whole lot of new implications to 'mood: dorky'), husbandman of nature, gentle-tittler,...