Mr Gallup’s claims come after the National Center for Biotechnology Information released findings in 2000 that showed there was a connection between oral sex and a diminishing occurrence of preeclampsia, a condition among pregnant women that sparks high blood pressure and protein to the urine.
Dr Gallup also believes that semen has anti-depressive qualities.
He published an article in 2002 titled Does Semen Have Antidepressant Properties?, which attracted headlines at the time.
He said: ‘I want to make it clear that we are not advocating that people abstain from using condoms.
‘Clearly an unwanted pregnancy or a sexually-transmitted disease would more than offset any advantageous psychological effects of semen.’