Condom

Condoms were used as a form of protection during sex. (TV: Co-Owner of a Lonely Heart)

Lauren Anderson's roommate left one for her. (HOMEVID: Zygon: When Being You Just Isn't Enough)

Jack Harkness insisted on using condoms when having sex with Brad, given the recent return of his mortality due to Miracle Day. Though Brad initially objected that they "don't need nothing in between", he relented after Jack said, "Lifetime of regret just got even longer." (TV: Dead of Night)

Ram Singh assured April MacLean's mother Jackie that he used a condom when the pair had sex in November 2016. He said he had spares. (TV: Co-Owner of a Lonely Heart)