He punts with Prossies who he may know in the business sense but could not know enough to trust his sexual health to them hence the use of the word strangers.
Indeed. In a relationship we get tested together and if the tests are negative we then do BB sex. Now if i had never ever trusted a woman i loved i wouldnt now have my son by our preferred method of shagging my then partner, her getting pregnant and producing him.
What others do is a matter for them of course, knocking her up was great fun to me and i am very glad i did it by that route rather than artificial insemination or other route where BB intercourse never has to occur between partners. I personally dont see the fun in that.