"Thirst-trapping" is a concept available to anyone online regardless of gender. A costume or alternate persona is not necessary for posting things meant to attract sexual attention, however the costuming itself may be part of the thrill.

It is not impossible for a male to thirst-trap as a female. A popular example who does this without an avatar or voice changer would be F1NNST3R.

If you want to emulate a specific character that you could not emulate naturally, an avatar and voice changer would be necessary. However, many voice changers are often deemed too abrasive or unnatural to obtain a full sense of immersion, so it would be best to look at your options and see which would be the best fit for you. One alternative would be voice training to present as female, despite being biologically male.
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