Advances in medical technology mean men can give birth, according to a fertility expert.
Lord Winston, who developed the technique of invitro fertilisation, said a man could carry an embryo and have it delivered by caesarean section.
'Male pregnancy would certainly be possible and would be the same as when a woman has an ectopic pregnancy - outside the uterus - although to sustain it you'd have to give the man lots of female hormones,' the doctor told Britain's Sunday Times newspaper.
He said such foetuses could be planted in the man's abdomen with the placenta, through which the baby would receive its nutrients, attached to an internal organ.
The professor, head of a fertility clinic at Hammersmith hospital in West London, acknowledged such pregnancies would be dangerous. There would be a risk of bleeding from the implanted placenta and the hormone treatment might lead to the man growing breasts.
But he believes the treatment might be popular, particularly among the gay community. 'There might be some demand among consenting homosexuals but I don't think there would be a rush of people wanting to implement this technology,' he said.