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If you mean without the condom, maybe a little better. Theoretically the sponge absorbs the semen as it liquifies and kills the sperm swimming in it. In practical use, the "failure" of the sponge is about the same as spermicide alone.
Alone sponge equals about alone spermicide. Either one with condom is better than either one alone.
Barrier methods (condom, diaphragm, cervical cap) protect against that not often event that the man's urethral opening is directly against the cervical os upon discharge. The power of that first shot will get many sperm into the uterus without being exposed to spermicide. All those (400 million) sperm wandering around need to be captured by the spermicide because it is quite easy for sperm to swim around the edge of the diaphragm or, even, out the open end of a condom if you linger.
In short, all barrier methods REQUIRE chemical backup and the sponge has that onboard.
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Brandye
Don't wear cheap bras!
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