It is really hard to persuade your girlfriend at times as it may annoy her. You need to be careful while convincing her about something. If you want your girlfriend to wear a diaper and want to convince her, you should stay patient and cool. You may tell her that you feel it awkward and don’t want to get wet. You should explain that wearing a diaper is not a big deal and it is hygienic as well. Both of you should be careful and use each possible precaution to avoid any sexually transmitted disease.