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An alternative system for sexual experience, similar to the base system, but that allows for cumulative counting of successive sexual encounters in an easy-to-understand fashion. 4 A stars is often abbreviated to simply "the four", or in some cases, just "four".
Example 1:

Person 1: How many A stars did you get last night?
Person 2: I lost count at 17.

Example 2

Person 1: That girl you took home last night - did you get the 4?
Person 2: No, but I got 3 A*s instead and her number, so I'm happy.
by R3G1C1D3 June 03, 2011
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