Sadak kabhi khatam hoti hai kya..???

Girl after Romance asked her Boy
Friend
.
.
Tum itna jaldi kyun thak jate ho,
main to nahi thakti..
.
.
.
.
.
Boy Friend:" Sadak kabhi khatam hoti hai kya..???
Hamesha petrol hi khatam hota hai...:p