Would a gin and tonic fit into this category?
Younger blokes seem to consider the drink a bit effeminate.
No. I really have no idea why some posters on here think that. Sure, it isn't a MANLY drink, but it's certainly not feminine. I'd argue it's one of very few gender-neutral drinks in that sense.
The whole idea than some drinks/aliments are manly or feminine is quite silly in itself.
What about those testosterone slushies that some athletes drink?
I'm talking about food and alcohol, not legal doping.