no i wouldn't
circumcision would expose the head, which is sensitive. So after a while it'll loose its senstitivity and overall, sex wouldn't feel as good...
and about the taste, eat acidic foods like fruits. Eat mangoes, apples, oranges, etc. They do something else in your body and makes the semen sweet. Take multivitamins too. And if you know and have access to it; take Goji Berries. About a handful a day.
Normally semen smells like ammonia and chlorine. Mine smells sugary-caramel like if i take the above. If he eats all that and still nothing changes, then he should watch what he shouldn't take. Like fast foods, garlic, etc...
i've read a testimony that this girl found her bf's semen tasted like pumpkin pie when he drank a fruit blended smoothie thing regularly.