Your partner can put it on his willy and it's nice for him, keeps his erection a bit longer (I think) and each time he thrusts you feel the vibration on your clit.. least thats what I think it is. not that I know
lol ive just emailed for mine, i think there really good, durex have a new one out its a bit of a funny shape though cant quite gather what you do with it but i will be experimenting as soon as this little bugger is out x