Historical clue formulations

• Planned Parenthood offering, informally — 2024-08-23
• Health class topic, in brief — 2023-07-16
• Health teacher's subject, informally — 2020-01-28
• School health class, informally — 2016-09-19
• Birds-and-the-bees class — 2016-03-01
• H.S. class in which contraception may be discussed — 2015-11-25
• School health course, informally — 2015-05-04
• Health teacher's topic, informally — 2015-02-24
• H.S. health course — 2012-09-25
• Determined the gender of — 2010-04-21
• Much-debated school subject, for short — 2009-01-08
• Private instruction? — 2006-09-23
• Popular H.S. class — 2004-11-27
• Popular high school class, informally — 2002-04-10
• Modern high school class, informally — 2000-07-16
• Health class segment, for short — 1999-04-23
• Part of a sch. health class — 1996-10-18
• Being male or female — 1995-01-27
• Sorted, as chicks — 1994-10-08