sexplanations is a YouTube channel hosted by Doctor Lyndsey Doe, a qualified sexologist, and I personally think it is awesome. It is educational without being dull or preachy. It covers all sorts of topics although I haven't seen anything that talks about chastity yet. I thought I would share this particular video as it includes a code for a discount from the sponsor of the video, a sex themed jeweler called Unbound. It shows examples of their wares including some nipple clamps that double as earrings and bracelets that can be used for bdsm/bondage. I would recommend that you have a look at the channel, there are all sorts of interesting videos including, for example, how to use a sex swing.