I haven't read the previous responses to your thread in the hope of using my own instincts to reply to your concern. It seems that with a problem such as yours, logic isn't all that helpful. I mean if we look at the facts:

a) You know that sexual urges serve an important biological function.
b) You know that there are many hundreds of thousands of single/partnered/married heterosexual men who regularly use dildos as part of maintaining their sexual health.
c) You know that there is no obligation for you to keep or indeed, even use the dildo.

So with all this in mind, it's obvious to me, as an outsider, that this issue is caused by a deeply rooted emotional response to thoughts and behaviours whose origin your therapist is no doubt helping you discover. To that end, i would advise you proceed with this idea under the guidance of your therapist. I don't know if they've already been informed but it is my hope that they would be able to provide you with continued support and assistance. I hope we here can continue to help you in our own way. All the best to you.