Right so me and my boyfriend always fantasize and talk about a threesome. But im quite body conscious after having my son as my body really isnt the same! So its part not wanting to get my body out and seeing him with someone who has a better body than me might be quite c**p lol! but i do like the idea of a threesome??
Do you guys masturbate in front of each other? If not, start with that.
Bringing in another girl doesn't sound like a good idea at this point, you are not liking your body and you will just be jealous no matter how much you think you won't. Sometimes ideas have to be just ideas, doesn't mean that it can't happen later on down the road but right now at this point at where you are at in your life it isn't a good idea.
Try new sex positions. Bring porn tapes home and try those positions. Go to a sex store together, strip for him and give him a lap dance - he'll LOVE that.
Good luck!