Within the Curve of a Woman's Arm" - Odo-Ro-No (Vanity Fair, May 1919)
The pattern
This still is filed under If-then promise.
Define
A conditional contract: if you do this, you get that. The sentence can be tested against the reader's own case.
Mechanism
Specificity does the persuading. The if names the action. The then names the outcome. Hedging kills it.
Verdict
We can name both the action and the result without adjectives
Why it works
The picture and the headline sell romance and the body copy sells fear, and the reader crosses from one to the other without noticing the switch. The central mechanism is the undetectable flaw: by asserting that sufferers cannot smell themselves, the copy disqualifies the reader's own evidence and makes denial a symptom rather than a defence, so no woman can rule herself out. Politeness is used as permission - Shall we discuss it frankly, plus the we and our that include the writer in the affliction - which lets a taboo subject be raised without insult. Blame is redirected to chemistry and anatomy so the problem is unavoidable but not shameful, and the doctor's box supplies the safety reassurance the fear appeal makes necessary.
Steal this when
Use this when the barrier is embarrassment rather than doubt, and the buyer would not raise the problem themselves. The pattern - beautiful promise above, frank acknowledgement of the taboo, then a mechanism that removes self-assessment as an option - is the right one for hygiene, health, breath, money and any private failing.