Depends. Dalia is portrayed as a very strong girl in-game (she's on images 4 and 6 here:Any Muscle girl in this game??? And if yes can you have sex with her??
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), but her model lacks well-defined musculature. You can have sex with her.There's also Micaela, who is a muscle girl, but is a deliberate gonk inserted into the game for your BFF to fall in love with and avoid any accusations of NTR.