i suppose the second to last line can refer to the anal sex... but it isn't really a leap people might make easily, so if that is what you meant, and there are only the mother and father... then you should tie that closer together perhaps...
i can see it being a fucked up love poem if you take the speaker as using the mother and father as an example in order to talk him/herself out of loving the subject of the last line... then the "anyway" and last line make sense...