Yeah, this gives deep penetration. However, the girl must be
flexible enuff. Another way is the girl on top gyrating.
As for doggie. if the girl has not-so-small a butt, then the
4-incher will be very much inadequate.. And the girl should enjoy
the 2 above-mentioned methods more than doggies, as the 2 methods,
if done correctly, will hit her G-spot easily/more easily 
