What is the meaning

Was just surfing MedHelp and came across the following links originally posted by WorriedUS 10/30/2006.
Indeed they are very good....thanks WorriedUS

http://ww2.aegis.org/pubs/mmwr/2005/r402a1t1.gif
http://www.thebody.com/Forums/AIDS/SafeSex/Current/Q174878.html

In the first link they give the risk per act..
In this I did not understand what is the difference between Receptive oral intercourse and Insertive oral intercourse. Arent they the same? then why is the risk associated with each different?

When i try to find the meaning of these at http://dictionary.reference.com/  I get the message--
"There are no dictionary entries for Receptive oral intercourse, but Receptive, oral, intercourse are spelled correctly"

Could some one help understand the meaning of these please
thanks

[hellothere123]

thats funny, i was confused about these meanings at first too.  i have come to realize that the receptive partner is receiving the penis is any kind of sex, and the insertive partner is the one with the penis.  if you were giving someone oral with your mouth, you are the receptive partner.  if you are the one getting the bj, you are the insertive partner.

[amaravatiboy]

Yes I too felt the same but was not sure so thought of asking someone.
thanks..
Wonder why the risk in case of receptive oral is twice that of insertive oral?
maybe its got to do with the high concentration of virus in the ejaculation fluid(if taken in) but then i read that our mouth (saliva) is not a good environment for hiv..
anyway ..in either case the risks are too low to worry about.
:-)