Can I get trichomoniasis from wiping the wrong way?

No. Wiping the wrong way promotes urinary infections from bacteria. Trichomonas is common in lady's mostly because changes in the acidity of the vagina. Live t. Vaginalis organisms in urine and semen samples have been found after being exposed to air for several hours. Although organisms are able to survive for hours on damp towels and clothes of infected women, it's unlikely to get it like that.