another state. The travel must be for the purpose of engaging in the unlawful sexual act. See also Hansen,. Huff, 291 U.S. 559, 562-63 (1934) and Mortensen I. United States, 322 U.S. 369, 374 (1944) ("An intention that the women or girls shall engage in the conduct outlawed by Section 2 must be found to exist before th