Mortals/anshi are half-gods/half-man (adm) - masterful Men (gbrim) of stature.

> **Gen. 6:4** - The-ones-distinguished (e~**nphlim** 5303) they-became (eiu
> 1961) in~(the)~earth (b~artz 776) in~(the)~days (b~imim 3117)
> the~those (e~em 1992) and~moreover (u~gm 1571) after (achri 310)(-) so
> (kn 3651) which (ashr 834) they-are-coming (ibau 935) **sons-of (bni
> 1121) the~Elohim (e~aleim 430) to (al 413)(-) daughters-of (bnuth
> 1323) the~human (e~adm 120)** and~they-(gave)-birth (u~ildu 3205) for
> (l~em 9999) they (eme 1992) the~masterful-(men) (e~gbrim 1368) who
> (ashr 834) from~eon (m~oulm 5769) **mortals-of (anshi 582)** the~name
> (e~shm 8034):p


Josh. 2:1 - Joshua sent two mortals to spy out Jericho. Likely noticeable, even at night.

> **Josh. 2:2** - And~he-is-being-said (u~iamr) to~king-of (l~mlk) to-say-of
> (l~amr) behold~! (ene) **mortals (anshim) they-entered (bau) here (ene)**
> the~night (e~lile) from~sons-of (m~bni) Israel (ishral)
> **to~delve-of/search-out (l~chphr 2658) ath(-) the~land (e~artz):**

Even the king's men didn't accuse the Israelite mortals of entering Rahab's for lewdness. And the king agreed with the assessment of his men.

In Josh. 2:4 and 2:6, Rahab secludes the mortals and let's them know that she is aware of their cause. Rahab is in awe of them. One commentary suggested that Yahweh knew Rahab's heart and sent them directly to Rahab's. 

I see absolutely nothing in these verses that suggest the mortals defiled themselves.