If you thought vagina hats were bad, there's something even worse. The music video is here because I had to see this with my own eyes.
Nothing about the article of clothing itself strikes me as particularly vulgar, but I watched a portion of the video in order to get the context as to why Janelle Monae and the other women in the video wearing vagina pants. This is a song about lesbian sex and the vagina pants only serve to reinforce the intended meaning of the lyrics. At about the one minute mark, a woman's head is between Monae's legs, likely so that it resembles a clitoris.
Musically, the song is pretty uninspired and annoyingly repetitive, but that would apply to most of 2018's chart-topping "songs". However, this song is being hailed as feminist and "woke", which is most likely what Janelle Monae was going for. At 2:26, "I grab back" panties can be seen on 2:26. "I grab back" is a famous anti-Trump slogan that was formed as a response to Trump saying "Grab 'em by the pussy" in a conversation with Bush. That image was a nod to the pseudo-progressivism of yet another generic sex song.
Marketing songs of this nature to cater to the "woke" audience reinforces the politicization of sexuality. There are ways to write about LGBT experiences without unnecessary politicization, such as to write about one's own personal experiences or speculation on what other people go through. You can even write a sex song, but own it as a sex song. Don't spoil the sexy with seemingly out-of-context political messages. Please.
https://www.nytimes.com/2016/10/08/us/donald-trump-tape-transcript.html