Is it normal to buy sex toys for your girlfriend/wife?

I have been with my girlfriend for 2 1/2 years. About 1 year into our relationship I decided to get her a sex toy. It was the butterfly kiss toy. Right before I bought this for her she went to one of those sex toy parties that people can host at their house. She went to one that her friend was hosting. After that I asked her if she would ever want a sex toy and she was open to it. So that is why I decided to get her one. Now the only thing is she does not have hardly any alone time. So since I bought her one we have been using it together in the bedroom. She loves it! I even got her to squirt with it. So since then I have bought two other toys for her. A rabbit and a purple itap. She loves all of them. But the only thing I wanted to know, is it normal for me to be buying them for her even though we use them in foreplay and not for her masturbating?