There is some variability in what Josy/Maya stuff you get, probably tied to the points you have with them and previous choices involving them.
On my Maya save, MC could only sleep with 1 of them. (this could be an indication of having solo routes in the future, despite them being together now)
On my Josy save, MC could sleep with both.
The only difference in the routes, besides chick score (major chick and the level below that) , was MC slept with Josy on the Josy save.
Potential/probable Maya/Josy routes.
Just Friends: Maya and Josy are together. Influenced by the HOT's as to if they stay together long term.
All together: MC sleeps with both, lead to a poly relationship.
All together: MC sleeps with one or the other. Potentially setting up future solo routes