Ad from 1954: If you are unmarried, you have the pay for sex education (or pretend to be married to get it for free).

Vital books on sex and health: Free! (only to the married)
Free! only to the married
Vital books on sex and health
– Mysteries of woman’s love
– Vigour without drugs
If you are married, you can get free copies of these booklets. They are sent together.
State your age and profession, when applying to –
The Manager
DAB Laboratories
BG Road, PB 1372, Delhi (India)