Sex can cause/lead to Pregnancy. Sex is related to Activity. Activity is related to Weather. Weather is related to Heat. 
Exotic is a synonym of Alien. Alien is related to Home. 
Pregnancy <--Causes-- Sex <--RelatedTo--> Activity <--RelatedTo--> Weather <--RelatedTo--> Heat 
Exotic <--Synonym--> Alien <--RelatedTo--> Home 