No, the article points out thar fewer (proportionately) young men are having sex, while the same proportion of young women are having sex. That's not the same as the less often / same rate description you give.
> I wonder if dating apps (Tinder, Bumble, etc.) are leading women to have sex with a smaller cohort of desirable men.
Social acceptance of homosexuality has increased, and every study I've seen shows that it's higher among women than men (and I think also higher for homosexual behavior by women than by men). Why do you assume that women must be only having sex with men?
If we assume that people with homosexual orientation attempting to conform to a heteronormative society would tend to have more trouble maintaining stable relations and thus cycle through relationships more frequently (which I think is plausible though not necessarily true), then a greater reduction in the number of members of one sex trying to conform that way would result in the kind of unbalanced drop seen in these statistics.