It's definitely not just caused by a lack of testing. The UKHSA is reporting a huge difference in positivity rates between men and women: "More adult men were screened for orthopox virus (3,467, 80% of all tests) compared to adult woman (447, 10% of all tests) and children (173, 4%). Monkeypox positivity rate was considerably higher in adult men, 54%, compared to 2.2% in adult women and 0.6% in children." See https://www.gov.uk/government/publications/monkeypox-outbrea...