In this study, tables 10 and 11 give the figures for sexual partners and frequency of casual sex between men and women. The figures for unmarried women make a bellcurve, but the for the men it's a bit unusual. 1 partner per year is around 43% for men vs 56% for women. 2 partners per year being around 15% for both men and women, but when it comes to 3 or more partners a year, around 25% of men and and 10% of women.

https://cdn.jamanetwork.com/ama/content_public/journal/jamanetworkopen/938482/zoi200181supp1_prod.pdf?Expires=2147483647&Signature=t1Xt1kfaENfXo4InR4XgIdl884dBx3304F28l17WuHmD98yCJLZuInme-5obTG32dpHFh6JnFjecMM%7EXJYtBWjgTpNDKCbNlYoGV-m50hLXcDR7sdxhcuQoQMsmlnEdFs82AwRqd9tjWKGBxlBq7mldt1llVA9whw99xg5jb%7Ehi6lx1pBWyyMtPH5vjPR6FYWxcX-T1IimpVlgCHIJyNF4zdeBPVE7miCoufkLfY5hIffeNrYq0wbgLpQNnHohJASHSgTFN8j%7EcjDSDK3eRppi4X535TP7gIqZEmhIfaD9JcA1b08ir%7EKPF4j-f-u3BFXh-7GmJAew53mP%7EqlXAFyw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA