"I suppose my policy should be to ask all female clients without discrimination about menstrual care products."

Ask everyone, if it's a provision (MSA) that applies to them. Don't you have a questionnaire? Focus on the MSA first, to avoid unnecessary queries. But then, you ask everyone. Not just female-in-appearance and young-adultish. The IRS explains qualified spending by any party:

https://www.irs.gov/instructions/i8853#en_US_2023_publink24188ld0e1123

"Qualified medical expenses are those incurred by the account holder or the account holder's spouse or dependent(s). Amounts paid for menstrual care products shall be treated as paid for medical care."

"Line 7

In general, include on line 7 distributions from all Archer MSAs in 2023 that were used for the qualified medical expenses (see Qualified Medical Expenses, earlier) of:

• Yourself and your spouse;
• All your dependents; and
• Any person who would be your dependent except that:
  • The person filed a joint return;
  • The person had gross income of $4,700 or more; or
  • You, or your spouse if filing jointly, are dependents of someone else."

How many MSAs do you see?

I may have seen one in my life.

That’s one more than I’ve seen

I'm not sure where that snippet is coming from.  It suggests that spending on these items are subject to additional tax.  But that hasn't been the case for years.  

"The CARES Act also modifies the rules that apply to various tax-advantaged accounts (HSAs, Archer MSAs, Health FSAs, and HRAs) so that additional items are "qualified medical expenses" that may be reimbursed from those accounts. Specifically, the cost of menstrual care products is now reimbursable. These products are defined as tampons, pads, liners, cups, sponges or other similar products. In addition, over-the-counter products and medications are now reimbursable without a prescription. The new rules apply to amounts paid after Dec. 31, 2019. Taxpayers should save receipts of their purchases for their records and so that they are able to submit claims for reimbursements."

https://www.irs.gov/newsroom/irs-outlines-changes-to-health-care-spending-available-under-cares-act 

California Form 3805P.   There is an additional tax for California.

CA does not conform to the federal law that allows a rollover from an MSA to an Health Savings Account (HSA) to be treated as a tax-free distribution. If a California taxpayer rolls over his MSA into an HSA, this distribution is treated as an MSA distribution not used for qualified medical expenses and is subject to California income tax and the additional 12.5% tax under R&TC Section 17215.

I asked for the women to respond but I got responses from men.  What does that mean?

I asked my wife how to broach this subject and she said I didn't need to and that I should "stay in my lane."  Ouch!

@Strongsilence-CPA      I'm a woman.

Well then! 

"but I got responses from men."

It's not supposed to matter. But for reference, we're all homo sapiens.

Speak for yourself.  Some of us belong to the Canis latrans family