Just had an update email from the covid.joinzoe.com/ symptom tracker and saw this:
"Tomorrow we will add some new questions. We have been asked by NHS England if we can help them to understand why men are more at risk from COVID than women. We have therefore teamed up with NHS researchers Dr. Louise Newson and Professor Janice Rymer, who think that oestrogen may play a protective role in fighting COVID. To understand this better, we have added a few new questions in the app that we can then link to the unique symptoms that 3 million of you have been experiencing. These questions look at things like contraception and Hormone Replacement Therapies (HRT) that impact hormone levels."
Interesting.... (although obviously too early for any definitive answers)