Finish clearing off the statues to look for clues

You decide that this is probably some kind of puzzle. You could potentially just continue down the stairwell, but this seems like something important. You stand back up, determined to solve this.

You first decide to finish clearing the vines off of the statues. On closer inspection, you still can't believe how detailed these statues are. You'd seen other women naked before at the public baths, but nothing like these women. Their curves are so alluring. You feel slightly ashamed for having these impure thoughts, especially about women, but with nobody around to judge, you feel more at ease to lust away.

Following the supple curves upwards, you realize that the statues aren't just bent over asses. They actually continue back and upwards further. You once again use ths torch handle to scrape away at the vines. It's difficult to get access to the other side of the statues, but you manage to maneuvre yourself around until all the vines are cleared away. You take your first look at the totally-cleared statues.

The three women look eerily lifelike now that you can see their faces. Judging by their facial expressions, they are in states of lust, pain, or possibly both. The right statue looks pleased, but moderately reserved, the left statue looks like she is in the throws of lust, and the middle statue looks like she is having an intense orgasmic episode. You also notice there is a holder at the base of the statue. One of the slots is empty, but the other two are occupied with phallic-shaped objects. You examine them closer; one is what you would imagine looks like a standard looking penis, but huge, and the other one is even bigger and appears to have various bumps all over. You reach down and the phalluses come right out of the holder. You take them to the front of the statue.

Obviously, these stone phalluses are supposed to be inserted into the statues. You're assuming there's supposed to be a specific way to fill the holes, and judging from your skeleton friend, you don't want to mess it up.