The Fated Mates podcast posted (on Bluesky) that "Elda Minger was the first romance novelist to put condom use on the
page. When we spoke to her about the choice she made, she told us about
the realities of the world before Roe, when abortion was neither safe
nor legal." They've put a clip of Minger's hard-hitting comments on YouTube and it's less than 4 minutes long. The novel is Elda Minger's Untamed Heart, which as far as I can tell was published by Harlequin in 1983. [If I've got that wrong, or if you know of a romance published earlier which includes condom use, please leave a comment!]
I missed this article when it was first posted, in 2023, but it's worth a read. Taking a look at witch romances set in small towns, Jenny Hamilton argues that
After reading a certain number of these books, it becomes impossible to avoid aligning the witch fear of non-witches with white fear of non-whites, particularly given the close associations between whiteness and small-town and suburban America.