

The law in question only prohibits biological males from participating in female sports. It does not prohibit females from joining boys teams.
There’s a simple reason for that - the second sentence is required under current interpretations of Title IX, while the first is not. The argument for that is about girl’s sports being a sort of protected space for girls, so it’s OK to bar non-girls (however your jurisdiction chooses to define that) from girls sports, but “boys” sports are actually for everyone who can compete.



This is not at all accurate. If a girl wants to play a sport for which there is a boys team but not girls team, she must be allowed to try out and participate on the same basis as the boys (a boys team is really an “everyone” team - this actually applies beyond schools and Title IX as no professional sports league in the US actually bars women from competing). Only girls/women’s teams get to set restrictions with respect to sex/gender. For Title IX, this is a wildly discriminatory interpretation of a low that bans discrimination, but it’s the one that has been in use for years.
And Title IX doesn’t require equal funding, but something much more nebulous about impact and opportunity that makes the whole thing kind of intentionally wishy washy so anyone they need to be can not be in compliance. To make it even more impossible to actually comply, questions of funding and opportunity are not limited to what the school itself supplies, so for example anything donated by parents or volunteers (such as the work of a booster club) also counts. So for example, if you cut funding to a boys team and parents more than make up the shortfall in donations and fundraising, it’s entirely possible based on that you might have to cut it further. Related, this kind of thing is why less popular boys sports are prone to being cut at the drop of a hat - football and sometimes boys basketball make money, most other sports teams lose money so the school is incentivized not to make cuts from King Football or Prince Basketball, but they have to target equal opportunity and impact between boys and girls athletic spending which means they spend what they’re willing to have as a cost on girls teams and cut whatever boys teams they need to cut to avoid cutting into the football budget, because the football budget has an ROI.
Per NFHS website (https://nfhs.org/stories/title-ix-compliance-part-iv-frequently-asked-questions):