It's not the word that's troubling, it's the practice that's troubling.
In our culture, which used to be a Christian culture (intil rather recently) it was understood that childbearing was supposed to be within marriage. Regrettably we fail in various ways, out-of-wedlock childen and so forth, but again (until recently) that was seen as something that fell short of the way it's supposed to be. It was not something you would set up to produce deliberately.
But we're more into perversity and "celebrate diversity" now, even on supposedly conservative websaites. A man and two women, two gay guys and a surrogate, two lesbians and their lab tech, hyperovulating your sister-in-law to get human raw materials, acquiring embryos as unconsenting human experimental subjects, generating dozens of half-siblings through insemination --- why not?
It's the premise of gay marriage: Screw "natural". We want what we want, when and how we want it.
I already stated in another response that using modern reproductive technology to produce children for homosexual/lesbian couples is wrong because it denies children the right to be raised by a mother AND a father.
However, that does not negate the benefit that modern reproductive technology is for married heterosexual couples who for whatever reason cannot have children the typical way (notice I did not say natural) :)