Nearly two-thirds of Britons think the fiery Italian sauce Arrabiata is a sex infection, according to a survey on Friday.
The survey, of 1,015 people and released on World AIDS day, also showed nearly half were unable to identify a range of common sexual complaints.
"What is very worrying is the lack of knowledge about sexually transmitted diseases (STDs) revealed in the survey," said sex therapist Emily Dubberley.
"Sixty-three percent in the UK thought an Italian sauce was an STD and over 43 percent couldn't identify any of the common sexual complaints we asked about.
"This ignorance has no excuse in today's world."
The survey, conducted by pollsters MYVOICE, also found that 48 percent of respondents found body odour and poor personal hygiene a turn off against just 4 percent who felt the same about a refusal to wear a condom.
The poll also found that 35 percent of people looked for information about sex on the Internet against 27 percent who consulted magazines.
In contrast only 4 percent went to their doctors.