Well, that's always everything individually. If you want it, and your girl expressed consent or shows the initiative, then there is no need to wait for an expiration of a term? I advise from simple but interesting options, try to discover BDSM culture. This is not terrible if you start using simple toys, such as the flogger in the article how to use a flogger, it is described in detail that it is a toy and how to use it. Ideal for beginners who want new feelings.