G spot position :: does not allow to enable it during sex. Excluding cases, when penis has curved shape during erection. That is why you should choose special position for G spot stimulation. Usually position from behind is advised, or woman on top when she can control movements of the partner. The most effective stimulation is reached with the help of special G spot vibrators. There is a wide spectrum of such sex toys today. Before buying, it's better to study your body and sensations. The peculiarity of G spot vibrators is their curved shape. They may have either slightly or sharply defined curve. G spot stimulators may be thin as a pencil, or thick, short or long.
You should not use :: douche and enema if your partner suffers from inflammatory diseases in rectum or large intestine, piles. Don't use self made, non standard or defective douche and enema. Nothing but pure water should be injected. Even recommended decoctions and solutions may have unpredictable physiological influence. If you would like to enhance cleansing effect of douche and enema, add a teaspoon of baby soap solution, or 1-2 tablespoon of glycerin. Don't use hot or cold water. If during the procedure your partner complaints about pain stop any manipulations with douche and enema.
Needless to say that :: silicone based lubricants cannot be used with silicone sex toys. As for 100% silicone sex toys, you will not face with such problems unless it is not 100% silicone. It is also fine to use silicone-based lubricants with condoms of just about any kind. You have to be sure that it is made from 100% silicone elsewise it may destroy the sex toy and break it down. Using silicone-based lubricant with latex toy, make sure to double-check the information about the product and sure it is safe to use with latex. Apply the silicone-based lubricant in small amounts, spreading it around slightly until the needed lubrication is achieved.