you're so stingy! Does a woman who is taking a bath in a private bath react to the erection of handsome men?

Watch her flirtation show up to her boyfriend! I asked my boyfriend who applied for a lie "I will investigate her cheating" to bring her to a hot spring near Tokyo and let her take a bath beforehand! She has an amazing expression like "Oh, mixed bath!" but it is a super-dock in the bath alone with a young man. Now, what is the result?