Although the female sex hormone is oestrogen, it is present in both the sexes.
Oestrogen is considered to be the 'female' hormone, whereas testosterone is considered the 'male' hormone. However, both hormones are present in both the sexes. Men produce oestrogen as well, but in lower levels than women. Oestrogen in males is secreted by the adrenal glands and by the testes. In men, oestrogen is thought to affect sperm count.