Slowly and carefully if his woman is sensitive and shy. He could start talking in a non-threatening place (like when watching tv or just looking around the net) about what he might want to try. He could show her some of the posts and things here on EF and first tell her his opinion and then as for hers. Don;t be udgemental about her opinions though, and understand that they may change as she thinks about the topic. The one place NOT to spring kinky things is in the bedroom where there is already some pressure to "perform" and a huge amount of vulnerability. If he is looking for a more sensual something different he could try some nice massage oils, soft ticklers, book or dvds about erotic massage ect. In fact that's where I started with Sigel, and it's a great way to bond (running yout palms over your partner's skin releases oxytocin into the bloodstream increasing the feelings of closeness and contentment) and it just plain feels fucking good! A relaxed blissful partner is going to be more willing to push a few boundaries.
Introduce new toys slowly and with some benefit to her until the "OMG he is using toys so I am not enough for him" is gone...that takes time and usually couples toys are easier to accept for more shy individuals. Ask her permission to buy somethig for her and then ask permission to try it out with her. All of these things will increase the bond between them and not be threatening.
Hope that helps!