It's not something every one experiences. There are so many levels. ..it's considered as an undesirable side but truthfully, it's actually kinda cool if you don't let it out of control... the very first thing she will notice, sex is different - she's more sensitive and more intense... considering she most likely cleans/showers at least once a day, her "love button" will be sensitive to the smallest touch at the next stage...then she will notice that it increases in size slightly when she's aroused...bonus for you guys as you don't need to go digging for it...then I guess the next step would be almost uncomfortable sensitivity and increased size when not aroused... most females don't get to that point if they pay attention... when you notice that you're getting to a point of discomfort, at any stage, back down your dose or stop completely. your love button will go back to normal.
Also some compounds have a more of an effect than others. For me personally for example, I can run var and primo with no sides. But give me EQ or winny and my love button becomes quite sensitive.
The ladies need to be very aware of their bodies and the changes while on cycle.