Possibly mere speculation of a 1974 author Mary M Luke in Gloriana: The Years of Elizabeth I - assumed and interpreted from a passage in an earlier biography (1957).
"She was a person of pure complexion, of the largest and goodliest stature of well-shaped women, with all limbs set and proportioned in the best sort, and one in whom in the sight of all men, nature cannot amend her shape in any part to make her more likely to conceive and bear children without peril."
Elizabeth's sex life remains a topic of considerable interest and debate today. In the Elizabethan period, the issue was a matter of constant gossip, not unlike now.
Although there is no evidence to this effect, England whispered about the possibility of Elizabeth having had ******* children. Yet her supposed celibacy, too, was equally gossiped about; rumours abounded that no one would marry her because she was infertile or had some sort of sexual deformity. However, the actual reasons for Elizabeth's continued single status were probably much more prosaic: it is hardly surprising that Elizabeth would have been afraid of marriage from a young age, since her father had killed many of his wives, including Elizabeth's mother, Ann Boleyn, who was beheaded when Elizabeth was not yet three. Likely it was the death of Catherine Howard, Elizabeth's stepmother, when the princess was eight, which scarred Elizabeth most greatly.