I've found either matching numbers, small difference (as you seem to be citing?), or skew in favor of women having more partners for 90s-00s cohorts. The stigma surrounding people with a high number of partners is something I've seen applied to both, and statistically, it does seem to invert marriage length.
1: https://www.cdc.gov/nchs/nsfg/key_statistics/s.htm#sexualact... 2: https://www.cdc.gov/nchs/nsfg/key_statistics/n.htm#numberlif... 3: https://www.ipsos.com/en-uk/sexual-fantasies-our-mispercepti... 4: https://bespokesurgical.com/2021/06/24/sexual-history-by-sta...