According to JB himself, Jack views Owen as a son, not as a mate or potential lover.

It's pretty poor of RTD to protray a male/male relationship as being about nothing but sex and a male/female relationship (Jack/Gwen, Jack/Estelle) as having more of an emotional element to it. Homophobics properly have a field day when it comes to Torchwood.

And frankly, Jack feels sorry for hismelf just as much as Ianto. And Jack cuts in on the Bride and Groom as they dance together - a very rude thing to do.