Generally speaking, a medium size yoni egg is ideal for most women who haven't given birth. So to reduce confusion about sizes, we recommend most women to start with a medium. However sometimes a “one-size” approach doesn’t “fit all”. So if you have given birth or maybe you haven’t had sexual intercourse yet, it might be nice to purchase a set of three (small, medium and large), that way you can explore the different sizes and what feels right for you on any given day. For example, a medium might be too small for you to hold inside (and may keep dropping out), so you might prefer to use a large egg to begin with (the vagina has to contract less to hold it in). If you are very small internally, a virgin or have a condition like vaginismus, you may prefer to begin with a small egg, making it easier to insert and hold inside.