90% of the time. When the boyfriend is around I always offer/he'll ask for some. Half the time he'll complain about the "bitterness" since he prefers milk and sugar, but knows better than to taint my tea with those.
Sorry, I just found this hilarious, because I have the opposite problem with my boyfriend! He was already using looseleaf and a porcelain teapot, but he likes his tea really, really over-brewed, as in, he'll boil the water (boiled, no matter the leaves), put in the leaves, and leave it steeping all day; he'll come back for a cup hours later and drink it happily. I can't take the bitterness. He's definitely learned that when we drink tea together, we're drinking it my-style.
There's an additional reason why I always brew the tea; there was an incident where he dumped out my leaves before I was finished with them while he was cleaning up the kitchen. I was so shocked and grumpy about it that he's been too scared to touch any of the tea-things in my apartment since! I'm really protective over my teas, so I guess it was a bit of a traumatic experience for him.