In the 1962 film The Music Man, after the librarian Marion Paroo turns down Harold Hill's advances, there is a scene in which the salesman engages in (fully clothed) "manspreading." The movie was considered "G" rated, so I imagine that the display was not too shocking for its time, even though the context of the act (the chasing of the librarian) made the intent clear.
On the other hand, Basic Instinct in 1992, thirty years later, featured an actress who spread and unspread her unclothed "legs," and that was considered shocking.
What accounted for the acceptability of Professor Hill's "manspreading" in 1962 versus Sharon Stone's, 1992. Was that "new" to the time, that is, the more expressive 1960? Was it because the people were clothed? Or was it less pejorative for men than for women?
Edit: I linked the film clip for clarity. The referenced scene occurs toward the very end.