adds the gender change potion as the blood reaction of pink slimes (pink slimes previously only had one reaction, and it's not exactly a barnburner). (#20149)

This item changes up the gender var of any gendered mob/living. Including people. There are a few interesting applications of this item, mostly if your into animal husbandry (all generic animals unless programed otherwise are all the same gender) but mostly it's just here to fill the immensely niche gap the loss of gender reassignment surgery left. Also it's 2:30 am.

Also factors out the old human var gender_ambiguous, as that surgery was the only way to ever trigger it.

code/modules/mob/living/carbon/human/examine.dm

@@ -162,12 +162,6 @@
 		if(100 to 200)
 			msg += "<span class='warning'>[t_He] [t_is] twitching ever so slightly.</span>\n"
 
-	if(gender_ambiguous) //someone fucked up a gender reassignment surgery
-		if (gender == MALE)
-			msg += "[t_He] has a strange feminine quality to [t_him].\n"
-		else
-			msg += "[t_He] has a strange masculine quality to [t_him].\n"
-
 	var/appears_dead = 0
 	if(stat == DEAD || (status_flags & FAKEDEATH))
 		appears_dead = 1

code/modules/mob/living/carbon/human/human_defines.dm

@@ -42,8 +42,6 @@ var/global/default_martial_art = new/datum/martial_art
 
 	var/special_voice = "" // For changing our voice. Used by a symptom.
 
-	var/gender_ambiguous = 0 //if something goes wrong during gender reassignment this generates a line in examine
-
 	var/bleed_rate = 0 //how much are we bleeding
 	var/bleedsuppress = 0 //for stopping bloodloss, eventually this will be limb-based like bleeding
 

code/modules/reagents/chemistry/recipes/slime_extracts.dm

@@ -472,6 +472,20 @@
 	var/obj/item/slimepotion/docility/P = new /obj/item/slimepotion/docility
 	P.loc = get_turf(holder.my_atom)
 
+/datum/chemical_reaction/gender
+	name = "Gender Potion"
+	id = "m_gender"
+	result = null
+	required_reagents = list("blood" = 1)
+	result_amount = 1
+	required_container = /obj/item/slime_extract/pink
+	required_other = 1
+
+/datum/chemical_reaction/gender/on_reaction(datum/reagents/holder)
+	feedback_add_details("slime_cores_used","[type]")
+	var/obj/item/slimepotion/genderchange/G = new /obj/item/slimepotion/genderchange
+	G.loc = get_turf(holder.my_atom)
+
 //Black
 /datum/chemical_reaction/slimemutate2
 	name = "Advanced Mutation Toxin"

code/modules/research/xenobiology/xenobiology.dm

@@ -383,6 +383,30 @@
 	if(!uses)
 		qdel(src)
 
+/obj/item/slimepotion/genderchange
+	name = "gender change potion"
+	desc = "An interesting chemical mix that changes the biological gender of what its applied to. Cannot be used on things that lack gender entirely."
+	icon = 'icons/obj/chemical.dmi'
+	icon_state = "potlightpink"
+
+/obj/item/slimepotion/genderchange/attack(mob/living/L, mob/user)
+	if(!istype(L) || L.stat == DEAD)
+		user << "<span class='warning'>The potion can only be used on living things!</span>"
+		return
+
+	if(L.gender != MALE && L.gender != FEMALE)
+		user << "<span class='warning'>The potion can only be used on gendered things!</span>"
+		return
+
+	if(L.gender == MALE)
+		L.gender = FEMALE
+		L.visible_message("<span class='notice'>[L] suddenly looks more feminine!</span>")
+	else
+		L.gender = MALE
+		L.visible_message("<span class='notice'>[L] suddenly looks more masculine!</span>")
+	L.regenerate_icons()
+	qdel(src)
+
 ////////Adamantine Golem stuff I dunno where else to put it
 
 // This will eventually be removed.