Almost all of Americans with internet access (96%) have made an online purchase at some point in their lives and 80% have done so in the month previous the survey.

In terms of demographic, American men and women shop rather similarly across all channels, but women are more likely than men to shop online (49% vs. 47%). Besides men reported spending 28% more online than women over the last year.
Both men and women are more likely to shop at large retailers and marketplaces. Both of them also spend similar hours per week online.

The Differences Between Men & Women in Adapting In-store & Online Shopping in 2017.