[OJFord]

Alternatively (I know nothing about the domain) perhaps allow the choice for free? (Needn't be 'tell me your gender here's data sharing agreement blah blah blah', could just be a choice between '~33lb' and ..whatever the current is that's apparently more appropriate for men.)

[aschismatic]

Yeah that's what I meant, sorry if I wasn't clear!

[OJFord]

Ah sorry - I read it as 'offer the full free-form weight [that it is/I assumed it is with payment] for free'.