The whole is greater than the sum of its parts
Although Mass Effect: Andromeda still hasn't received its official ESRB rating, BioWare general manager Aaryn Flynn announced that the game is shedding the "partial nudity" content descriptor in favour of the "full nudity" one.
Remember. We lost the "partial nudity" rating and got full "nudity". https://t.co/yauGf9Cnol— Aaryn Flynn (@AarynFlynn) February 26, 2017
Considering Natalie Dormer, the voice of Dr. Lexi T'Perro, hails from a show famous for coining the term "sexposition" and the reputation of the Mass Effect series itself it's not a massive shock the ESRB are taking their time.
Although the European rating is still not available, the harsher Australian rating classifies it as MA15+ with “strong sex scenes and violence".