Nikki was particularly shocked - but highly intrigued - by her admissions, which came during a group-wide discussion about sex.
"Have you ever let a guy piss on you?" Nikki enquired, in the wake of Lea's revelation that she loved giving oral sex to a man when urine was involved.
"Of course I have, and in me," Lea replied, adding: "I've sucked a guy's cock before when it's been up my arse and had jelly on it."
Nikki described such practices as "revolting" but Lea insisted that she found it "normal".
Having determined that Lea could fit an orange but not a melon inside of her, Nikki went on to ask about Lea's most horrific sexual experience.
"I had an experience that nearly killed me because it hurt a lot," Lea replied seriously.
At first she refused to be drawn on the particulars of the incident but a combination of hints and clever guesswork eventually led the housemates to deduce that Lea's insides had once been ravaged by an electric whisk.
"It went drastically wrong," she conceded.