Sex has more to do with than the size of a Penis. Yes it is okay to say that word.
First of all, if you are not in love with the person, forget it! You have already lost the battle for good sex! I find being married to and in love with my sex partner half way there! A lot of the feeling comes from the heart. You need to feel safe, secure, loved, needed and wanted. You need to make sure your mate feels the same. Kissing is very sensuous, but again if you are not kissing the person you love, where are the sparks? Massages are sensual, but I wouldn't want to give a sensual massage to someone I didn't love, and visa verse. Next is the genital foreplay. If you love the person you are with, and they love you, it is okay to tell them what feels good, and visa verse. Women have more than one "feel good" spot. Most men are not aware of this! Then of coarse there is intercourse. Make sure you are never dry! If you are it will dull the sensation. Kiss and cuddle, touch is the most erotic sensation of all!