hi! i hav a little prob. The day after i have sex w/my bf, my vagina and inside it gets really itchy? is this a normal thing? we've been together for a/b 2 years and neither of us have stds. we always have great sex

, i love this guy. is there something wrong with me? i'm a very clean person, maybe a little too obsessed w/cleanliness, so thats not a prob. i always pee b4 and after. i'm on bc pills too (ortho tricyclen) if thats makes a diff.
the only way to get rid of the itching for a little while is to use my shower head on hot water on the area. but, i dont' think its really a good thing to be doing that on such a sensitive area. othertimes i tried using monistat cream inside and it seems to help. But i feel like i'm not doing the right thing, seeing that its really for yeast infections, although it does say its for itching too. i feel liek i shouldn't have to keep doing this, but i dotn' kno what to do.
also, i got anthr question. just wanna kno if i'm being too obsessed or not. When my bf fingers me, should I make him wash his hands

or ask him if his hands are clean b4 he goes in? i had uti's before and i thought it was b/c of not washing his hands right b4 we fool around.
please help me out here. am i doing somethign wrong.