The classic classroom demonstration where teachers dropped a condom into baby oil to show how oil-based lubricants degrade latex has largely vanished from UK sex education, according to educators and experts. The experiment, which once horrified teenagers as the condom dissolved before their eyes, aimed to teach a fundamental lesson: never use oil-based lube with latex condoms.
Why the experiment matters
Studies, including one published in 1989, confirm that oil-based lubricants break down latex condoms, rendering them ineffective against pregnancy and STIs. Dr Henry Blest, co-founder of Polari Labs and a panellist for Queer Health, said his lab tests show condoms degrade in oil-based lubricants in about 25 minutes. 'What struck me was how invisible the risk is: the warning on the back of the bottle is tiny, and oil-based lubes are niche enough that most people would never think to look for it,' he told Metro.
Sex education today
Lucy Emmerson, chief executive of The Sex Education Forum, said relationships and sex education has been mandatory in English schools for five years, but lesson quality varies. 'Teachers are doing the best they can, but most have no formal training in sex education,' she said. 'It's high time this changed.' While lessons on condoms and contraception are now standard, interactive activities like the oil experiment depend on teacher choice and lesson length.
Oil-based lubes and condoms
Sex and relationship expert Gigi Engle, author of Kink Curious, said latex condoms and oil-based lubricants are 'completely incompatible'. 'It can break down latex and cause condom breakage, making it ineffective,' she explained. Despite this, oil-based lubes have grown popular for their longevity. Annabelle Knight, Lovehoney's sex and relationship expert, recommended water-based lubes as safe with all condoms and silicone toys. 'Condoms are the most effective preventative measure against both pregnancy and STIs, so you don't want to risk breaking them,' she said.
The right lube for the right act
Experts advise choosing lubricant based on the type of sex. Anal play requires generous amounts of thicker gel, as the anus cannot produce natural moisture. Silicone lubes are long-lasting but may damage certain silicone toys. Water-based lubes are versatile and safe for most uses. Checking the product label is always recommended.
