The Indochinese/Vietnamese Communist Party actually considered inter-party fucking to be incest. Party members called each other "brother" and "sister" not just as a sign of respect but also to forge sibling-like egalitarian bonds. Other types of relationships in Vietnam were very hierarchical, including husband-wife back then. Sleeping with your fellow party members was definitely as frowned upon as incest and could get you in serious trouble if you were in a leadership position.

In one story I read, an underground local city committee discovered their regional commander had pressured one of female guerillas into sleeping with him, so the other members of the city committee found their commander and slit his throat. Normally this would have had them killed themselves but when the city committee explained the situation the party agreed that the commander had indeed committed the crime of incest so his killers were forgiven.

Point of this: DSA needs to introduce the death penalty for sex pests in their ranks.