trust me..when you have an orgasm youll know it! and no its not weird at all and your not obsessive...my first serious BF couldnt get me off for 8 months..and trust me he was trying...i know women who are well into their 30's and havent had a "big O". this made me smile sooo much "dont ask me buddy i will be just as clueless as you!" so here..i found this..
"Orgasm is the point at which all the tension is suddenly released in a series of involuntary and pleasurable muscular contractions that may be felt in the vagina and/or uterus (some women do experience orgasms without contractions).
The orgasm happens when excitement seems to go over the edge -- a climax or crescendo is reached which may last several seconds or longer. During orgasm the body stiffens and the muscles contract. Involuntary muscle contractions and spasms may occur in various parts of the body, including your legs, stomach, arms, and back. The muscles of the vagina relax and contract rapidly, as do the muscles of the uterus. The glands of the vagina (Bartholin's glands) discharge a watery secretion, which acts to lubricate the vagina. It is often said to be the equivalent to the male ejaculation."
oh and that was on here
http://www.coolnurse.com/orgasm_female.htm
wish you luck