Treating a woman with progesterone during pregnancy appears to be linked to the child's sexuality in later life.
In the latter, it is involved in the menstrual cycle and helps foetus development – specifically neural development and the production of sex and steroid hormones.
For this reason, when women are at risk of miscarriage they are often treated with progesterone.
The participants came from the Copenhagen Perinatal Cohort, a database that was collected on children born in Denmark between 1959 and 1961.
They included 17 men and 17 women whose mothers had been treated with progesterone, all of whom are now in their mid-20s.
Responses were then compared to a comparative control group, whose mothers had not received progesterone treatment.
Researchers note that many factors are involved in the development of sexual orientation, with progesterone potentially being one of these. »