Thanks for writing to us again.
Since she put it on with her mouth, and if she has an active infection, then theres a possibility of him getting infected. However the good thing is the incidence is low and also people start experiencing symptoms like discharge from penis, along with burning micturition and pain in testicles.
Gonorrhoea would have also manifested by now, however there's no history of painful burning discharge from the penis. If he starts developing any of these symptoms, its better to consult a local doctor, who can put him on antibiotics such as Ceftriaxone.
Hope that answers your query.