My standard disclaimer, that this is based on just the data files with little to no field testing, applies, but success chances for romantic interactions, including WooHoo, seem to be boosted if the target sim is Dazed, and a fair bit at that; it's as effective as the target sim being Very Flirty. Dazed seems to be the Sims 4 equivalent to drunk.
Also, Alluring, besides increasing the success chances for anything related to WooHoo, Romance, or general flirtiness, also increases by 2 the Charisma effective level. Not always useful, as many tests seem to use the base score, but might still be good to know.