Yes its safe, provided you are sure that none had any sexual relationship with others before. You are sure of a monogamous relationship now.
As long as both donot have a plan to have any outside experiment, its perfectly okay. I would prefer to have a test done before to be absolutely sure there is nothing brought forward from any early encounter.
I love people like you who are on monogamous relationship. On your nest question dont forget to mention your age. And dont just get the pleasure alone, give her the same treat too.