You may have first thought of these things after seeing them in porn, but the notion that they are dirty or amoral is surely from society. Human sexuality is really diverse and we don't understand 100% where different impulses come from, but what I do know is that anything that excites you and that is done with your partner's full consent is healthy and fine. Women, in particular, get bored easily with the same old, same old sex so spicing things up a bit with some or all of these fantasies would probably be a very good thing if your partner is up for them.

Here's something I wrote a while ago about gaining access to myself as a fully sexual being that might be helpful to you.

https://medium.com/sensual-enchantment/taking-the-lid-off-the-sex-box-4151bb9a0b01

Sexual energy is life force, and learning to allow it to flow through your body can be a really empowering in ways beyond how that manifests in the bedroom.