Sounds like you can use a little help, like a nice licking and tongue plunging along with your toy. Seems to do it for my lady friends..

Is this the HMU original or HMW cordless? There's been quite a bit of research on the HMU original and like toys that show that while it may feel good for a time, with extended use it can actually deaden nerve endings because of the force coming off of it (especially if your using it on "rattle my teeth out" setting). Apparently because the cordless has a softer cover (silicone vs vinyl) it's a bit easier on nerves. However it still doesn't get away from the initial problem--it slamming something against your bits thousands of times a second.

There's an alternative that I think is just as good, of not better than the HMW. Instead of using a rotary vibrating motor, it uses an  oscillating motor that goes around the problems of a rotary motor. They're not cheap (I think I paid $300 for the package I got w/ mine) but it's worth it.  

Link below....