Alyssa Rosenberg analyzes the milestone:
The show was very careful to equate Kurt and Blaine and Rachel and Finn, shooting both couples in essentially similar positions of repose, clasping hands the same way, and similarly clothed. In a way, I think it’s more useful to make the couples as similar as possible, rather than focusing on the mechanical differences between the way they’re going to get down. Given that conservative stereotypes about gay men in particular focus on the idea that gay people are promiscuous and emotionally detached, tenderness is more confrontational to those beliefs than actually shooting a sex scene.
The Dish 