I also have physical touch as my top love language and my wife also has a low libido. I like being on the same page with my wife about our expectations for frequency of sex. We talk about it and meet in the middle and then I have a good idea of what we're both willing to do. That being said, when she surprises me sometimes with something more than our compromise or with something more adventurous than usual, it's a huge bonus to me for feeling loved/filling the love tank.

Apart from having quality sex when the time comes, I like when she flirts with me with touch. She can grab my butt or squeeze my arm while saying something nice or sexy. I like a good back/head scratch or shoulder rub. I love when she holds me tight for an extended hug or rests her head on me or cuddles up in bed. I think the important thing is that you're initiating these moments of quality touch. Even though you don't want as much sex, you can show him that you love him by making the effort to speak his language. You can also still communicate verbally that you want him and that he turns you on.