Chick #30 (1970) - hinting at lesbianism, and some kinky thigh-high
Chick #31 (1971) - first text on cover (other than “Chick”)
Chick #33 - Hinting at a blowjob, of course. First time the issue
Chick #34 (1971) - First bondage and erect nipples on a cover.
Chick #35 - horror film motif
Chick #36