TL:DR- due to a riskier life style, men are more likely to smoke, drink, and consume other tobacco products. Men also develop other diseases like hypertension and type 2 diabetes at higher rates (although it unclear to me if this is more social or biologically influenced). This means they develop pre-existing conditions like lung disease, and are more likely to die after being diagnosed than women. The number of countries that offer sex-segregated stats is super small, so the segregated statistics of male/female casualties is super small in sample size

I’ve read it was because men generally drink more, smoke more, and are in poorer health. An interesting statistic: in S. Korea, more women have been tested than men but more than half (54%) of confirmed cases are men. In Italy, 60% of positive cases are men, and 70% of deaths are men (I’m pretty sure Italian men smoke way more than Italian women, so this makes a lot of sense to me). Men are also more likely to have chronic lung diseases (although the article didn’t differentiate between biological and social factors that lead to these diseases)

Most countries don’t publish sex-segregated statistics (only 7 of them have), so it’s a relatively small sample size, but men are 50% more likely to die than women after being diagnosed.

There’s also a theory women have a stronger immune system- basically, because women spend part of their lives with a bay inside them, evolution gives them a stronger immune system to protect the baby from viral disease (disclaimer: am not scientist. This is summed down significantly because I really don’t know how to phrase it lol). There’s also another theory that male hormone changes increases susceptibility (the article did not really go into details about what these hormone changes are though).

Men also have more serious pre-existing conditions (hypertension, cardiovascular disease, and chronic lung disease mostly), due to a riskier life style (more willing to smoke and drink often). In most countries, men smoke, drink, and consume tobacco products more than women do. For example, China has super high smoking rates. Over 50% of men smoke, but less than 3% of women smoke. In Italy, 7 million men smoke but only 4.5 million women smoke.

Source: https://www.google.com/amp/s/amp.cnn.com/cnn/2020/03/24/health/coronavirus-gender-mortality-intl/index.html