Hey I'm a girl so I have a few ideas and myself I find it difficult to orgasm sometimes.Dressing up,yes very good idea,and try a few crazy positions,you'd be surprised how many great spots you can hit.Also maybe just try cuddling and kissing etc,maybe with a movie,for a while before so you feel loved and comfortable and completely at ease.Being tense about not being able to come might stop you from coming as well.Hope that helps x x x x