To get the EH (Enhanced High) Lust samples for the doctor, I thought that your lust had to be 100.
Usually to achieve this, I get my lust to 100, then take the blue pill, then masturbate which brings my lust to 80. Then I go to the pool and try to put lotion on a girl, making sure to do her side boobs without angering her. This gives you +20 to your lust. If no girl is available, I pick one who I find highly attractive and grope and kiss her. This can reach +20 in 60 minutes. Once my lust is 100, I masturbate again. Now time is short, to get a third sample from 1 blue pill, I take a green pill to add 20 to my lust and masturbate before time on my blue pill runs out.
We had a bug about a year ago where the doctor wouldn't give you a quest for the last girl on the island.
From my FAQ:
To get a hack for Jennifer's implant: (also works for Yumiko & Joy)
jennifer.monitoring_sub_dermal= 3
jennifer.monitoring_sub_dermal_hacked = True
To make this work for any girl:
name.monitoring_sub_dermal= (1-3) (1 is the hack you get from the doctor, and 2 & 3 are from your hacking skill)
name.monitoring_sub_dermal_hacked = True