Morning sickness - so named to make what is in fact perpetual nausea sound like it's only something you'll have to put up with for so long every day. But the truth is that "morning" sickness can and does strike at any hour. For some women it's a relentless nine-month battle to keep down even the simplest black tea and dry toast, while for others it blessedly lasts only a few months.

Whatever your experience with morning sickness might be one doctor is sure it can be cured with a daily dose of semen. Not just any semen, mind you. It's got to be your baby's daddy's semen because that will help your body get used to the foreign DNA you're harbouring in your womb.

While some doctors believe that morning sickness is the body's way of keeping deadly pathogens away from a newly created foetus, Gordon Gallup a psychologist at State University of New York at Albany, USA, thinks there might be another explanation at hand. He theorises that our immune systems are reacting to the foreign DNA in our womb. The foetus is partly made up of someone else's DNA after all - a fact that Gallup believes has our immune systems in a spin.

He takes his theory further to say that modern contraception - particularly those that make use of barriers (such as condoms) mean that women are typically less exposed to semen. That is, until they want to get pregnant, but by that time our bodies are not familiar with this foreign DNA and therefore try to expel it.

Gallup believes there's a fairly simple cure: exposing yourself to more of that same genetic material that got you feeling nauseous in the first place. This is a way of training your body to accept this new material without putting up such a fight. Certainly good news for the soon-to-be fathers out there since the prescription means that sex (and lots of it) is on the menu before and during pregnancy to help eradicate those nasty morning sickness symptoms.

Gallup's theory has yet to be laboratory tested. While he has a rather novel theory, it doesn't really hold when we compare women who have never used contraception to those who only come into contact with their donor's semen when they undergo artificial insemination. Surely the women who undergo artificial insemination should have worse morning sickness…