Is a Static IP Risky?

Paolo asks...

I use a FTTH service to connect to the internet. My ISP owns a private fiber network and it connects users to a limited number of routers with access to the internet, each assigned to a different static IP address.

Services like Skype and TeamViewer work, I guess, using some sort of UPnP, but by default you don't have the option to freely forward ports. However, if you call them and ask to enable port forwarding, they'll do it for free. And that's what I did last week.

To my surprise, they now assigned me a static IP address.

Are there any more security risks for connecting to the internet using a static IP?