Ulysses by James Joyce Chapter 17 Page 182

prudently, as entering a lair or ambush of lust or adders: lightly, the less to disturb: reverently, the bed of conception and of birth, of consummation of marriage and of breach of marriage, of sleep and of death.

What did his limbs, when gradually extended, encounter?

New clean bedlinen, additional odours, the presence of a human form, female, hers, the imprint of a human form, male, not his, some crumbs, some flakes of potted meat, recooked, which he removed.

If he had smiled why would he have smiled?

To reflect that each one who enters imagines himself to be the first to enter whereas he is always the last term of a preceding series even if the first term of a succeeding one, each imagining himself to be first,