I am not sure who the father of my son is. Is it possible to tell the father of the baby simply by knowing blood types and Rh factors of myself and the potential fathers?

My wife and I had our first child last July. Until about 3 months ago, she was unable to reach orgasm at all. Of late, she has very small one's, but they don't seem to be getting much better. Prior to having the baby, she had strong, very quick (3-5 minutes) orgasms 90% of the time. I know the stress of being at work rather than home with the baby could play a part in this. Is this common and is there a way to mitigate the problem? 

If one has a long-term partner and neither AIDS nor any other STD is a concern, is there any medical reason not to perform cunnilingus on a menstruating woman? My significant other is particularly horny during her period and would love cunnilingus at this time. I am willing but curious.

I've been having this problem with my girlfriend. Whenever we make out, I get the impression that she wants me to do something with her breasts... but I don't have the foggiest what to do.

I'm sure that they aren't there strictly for my enjoyment; so, what can I do with my girlfriend that would offer her some pleasure, as well?

I've tried other sources of information, but most other sources either concentrate solely on the vagina, g-spot, and clitoris, or they simply state that breasts are an erogenous zone and leave it at that.