When we think of all the things we want to do with our other half the answer should be simple; we should want to do absolutely everything with them. We should want to experience everything, feel everything, see everything with no one but them by our sides. When we look back on our lives it's not the things we did do with them that we'll regret, it's the things we didn't do.
Humans — who enslave, castrate, experiment on, and fillet other animals — have had an understandable penchant for pretending animals do not feel pain. A sharp distinction between humans and 'animals' is essential if we are to bend them to our will, make them work for us, wear them, eat them — without any disquieting tinges of guilt or regret. It is unseemly of us, who often behave so unfeelingly toward other animals, to contend that only humans can suffer. The behavior of other animals renders such pretensions specious. They are just too much like us.
A dim antagonism gathered force within him and darkened his mind as a cloud against her disloyalty: and when it passed, cloudlike, leaving his mind serene and dutiful towards her again, he was made aware dimly and without regret of a first noiseless sundering of their lives.
Why was the human race created? Or at least why wasn't something creditable created in place of it? God had His opportunity. He could have made a reputation. But no, He must commit this grotesque folly - a lark which must have cost Him a regret or two when He came to think it over and observe effects.
China didn't want to lose the cutting edge of technology. So the idea of having a Sina Weibo was an attempt to compete with Twitter. However, it has no soul - which is freedom of expression. Nevertheless, I think the government regrets having Sina Weibo, but they cannot shut it down. That would definitely be suicidal.
Because the rhythm of conversation makes no allowance for dead periods, because the presence of others calls for continuous responses, we are left to regret the inanity of what we say, and the missed opportunity of what we do not.