...Rob then makes an argument from silence which is in fact misleading. The argument is this--- "Jesus never said anything about homosexuality". This is not quite true. Jesus took all sorts of sexual sin very seriously, even adultery of the heart, as Rob admits, and so it is no surprise then that we find Jesus telling his disciples in Mt. 19 that they have only two legitimate options: 1) marital fidelity (with marriage being defined as a relationship between one man and one woman joined together by God which leads to a one flesh union), or 2) being a eunuch for the sake of the Kingdom.
The term 'eunuch' here whether taken literally (as in a castrated person who is incapable of normal sexual intercourse), or simply morally (as in a person who never engages in sexual intercourse, remaining celibate in singleness, though he or she is capable of such an act), makes very evident that for single persons, any single persons, celibacy in singleness is the standard Jesus holds up for the unmarried.
Nor, in view of the way Jesus talks about marriage in the context with the discussion of the original Genesis story about the creation order-- the creation of woman for man (and their interdependency), could one ever imagine Jesus redefining marriage to include same-sex sexual partners. Jesus is not silent on such matters at all-- fidelity in marriage and celibacy in singleness are his standards, and indeed they are standards by which Jesus himself lived when we are thinking about the celibacy in singleness issue. He is likely talking about himself when he speaks of persons who have chosen to be eunuchs for the Kingdom. Chastity was considered a great virtue in that honor and shame culture.
Rob then raises the point that the Bible says nothing about sexual orientation. This is true, but irrelevant. It says plenty about sexual behavior, including same sex sexual activity between consenting adults in Romans 1, 1 Cor. 6 and Gal. 5, to mention three texts. It is simply not true that the Bible is just opposed to pederasty or male prostitution, though certainly both of those forms of same-sex sexual expression are prohibited. The terms used in 1 Cor. 6 refer to males who play the role of 'malakoi' or the soft or effeminate role, and those that play the aggressive more male role called 'arsenokoites'-- which literal means a male who copulates with another male (and the word certainly does not imply copulation only with under aged males). On all of this Rob really needs to read Rob Gagnon's definitive work The Bible and Homosexual Practice (Abingdon).