My thoughts - Zoya is 100% woman and she is fabulous!
The visitor (taboo?) is cute and intriguing but the only real turn-on is the temptation and tension she provides with Lev.
If Zoya wanted to explore women, or open-ended relationships - that would be fun too!
Lev, well... I will be generous and say little about that. Perhaps he can take a supplement to boost his sex drive?