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Birth Control For Men Edges Closer
ananyo writes "Developing oral contraceptives for men has not gone as swiftly as researchers imagined in the early 1970s; they suggested at the time that a 'male pill' was not far off. But researchers now report a new way to make male mice temporarily infertile. Although the treatment is not ready for human use, the method avoids some of the pitfalls of earlier attempts. The technique appears to have a much more specific action than previous methods: it impairs sperm production by blocking a protein called BRDT. This protein was singled out as a potential therapeutic target five years ago because it only occurs in the testes, where it is required for the division of sperm cells. If the approach proves safe in humans, it would be an improvement over hormone-based methods of male contraception, which are not completely effective and cause side effects such as mood swings, acne and a loss of libido (abstract). On the downside, however, the compound 'shrank the mice's testes.'"
The page 5 of the original article PDF has a size comparison of disected specimens. The treated mice testes weight is roughly halved but the size is 2^(1/3) ~ >0.70 of the untreated ones.
There is a meassurement device called Prader orchidometer that works by comparison with standarized orbs. It's very difficult to get an accurate size/volume in vivo without using ultrasounds and if even the orchidometer method is not precise much less expect that anybody could notice a significant difference just looking at them.
Certainly after some time not even yourself will notice at all. Definitely noticeable if meassured or compared side by side, but most probably irrelevant for a partner. The major issue may be the own psychological selfesteem burden that some insecure people could have of knowing that their testes shrank a bit, but far worse and by large would be that you got instead a vasectomy and later couldn't reverse it.
Always could do nothing and let all the responsability to your girlfriend/wife behaving like a macho(TM) or just ask for her opinion about it and decide together since also are "her nuts".