Table 2: Term frequency-inverse document frequency of top 50 unigrams in posts.

test	119	month	49	condom	36
herpes	92	pain	49	year	36
std	81	hpv	48	infect	35
like	76	hiv	48	negative	35
sex	75	feel	48	thing	35
day	74	doctor	45	oral	35
know	73	wart	45	went	35
week	67	start	44	red	34
time	67	look	44	little	34
got	66	thank	42	itch	34
bump	63	guy	42	area	37
symptom	60	want	41	tell	33
think	56	possible	40	thought	33
help	55	girl	40	right	33
penis	54	said	39	skin	32
worry	52	chlamydia	39	say	32
notice	51	use	37