What does AIF stand for? Adult Interactive Fiction. If you likely to be offended by games with sexual content, you are advised not to read further.
 

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Walkthrough by hsvsunshyn (hsvsunshyn@yahoo.com)


open drawer
x counter
get syringe and slide
get flask and gloves and mask
wear gloves and mask
kiss mark
mark lie on table
tie mark with straps (not "put straps on mark")
x mark
take powder ("get powder" does not work)
put powder in flask
use syringe on mark
use syringe on slide
put slide on microscope
north
get wrench
open container
get blue vial and yellow vial
south
use wrench on control panel
enter data in computer
read computer
mix blue vial with yellow vial
give mark antidote ("give antidote to mark" doesn't work)


This solution gives you 22 out of 23 points, and no sex. You can perform various sex acts on mark, such as "rub/suck cock" and "titfuck/fuck/assfuck mark". Most or all of these deduct points, so you can easily end up with negative points.