hahaha .. you again :D
History proves that this is got to be the only reason. Any other reason was not proven as a general case.
I am not sure if it makes a man appear weak or strong, but that is the only reason.
Infertilty can be taken care of by Medication or adoption. If wife is incapabale or simply frigid, a divorce is the answer, if helping or providing support to a poor woman then one can give her money, marrying her is not the solution.
Every other reasoning has other solutions available, Sexual drive is the only reason that can be taken care of by marrying more.
In past, sexual drive and creating more social links with elites were the reasons.
TLK where there is man...there is sabr...and sabr is not an alien concept...
self restraint teaches you to NOT satisfy every erec****. otherwise there is no difference between a man and janwar/haiwan.