Yes seals mate and different species have different mating stategies. Some species mate on land and some i the water, Males in some species can mate with lots of females a year some can only mate with a few at most.
for example elephant seals have what is termed extreme Polygyny where a larger dominant male will defend and mate with a large hareem of smaller females that come ashore to pup. see:http://www.theanimalfiles.com/glossary/delayed_implantation.html )
Other seals, like many ice breeding seals, the males can only defend one or a few females (as the females are not grouped together) at a time so they father less pups per year.
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