Here is a collection of links to old-timey sex and porn resources! You'll thank me for info and the laughs.
The Pearl: An 1870s erotic magazine The Slippery History Of Lube The History of Personal Lubricant - this references condoms, which were extremely rare in the 1920s and 30s
Tips:
In England, drugstores and pharmacies were referred to as "chemists", as in "I'll just pop down to the chemist's."