if your in the dating phase and your honest with every guy your talking to that's fine.
but if your in a relationship with guyA then your cheating on him with guy B.
Do you like guy A because he's nice, and buy you things, and you can trust him? do you have strong feelings for him?
if your grossed out by the kissing and sex your going to have to talk to him in a nice way to makes things better or you will get tired of it and stray away.
how could you be confused about anything, you only met guy B a few days ago.