i remember ST mentioned about waiting for 2 weeks,i think this time was for to show RK to realise that he has fallen for madhu.
next week when the party drama will unfold n next morning both madhu,RK will be too embarrassed to learn about the night.
madhu will decide not to see RK anymore as she thinks RK has succeeded to take the revenge for 5th slap or rather she let him do that.
RK truly guilty this time goes to apologise madhu but madhu will be adamant not to see him again.
so in oder to woo back his madhu,RK will trick something n she will be dragged into this film world unwillingly.
but i don't want madhu get preggie n end up like other serials..just like mentioned in this article..
http://www.bollywoodlife.com/news-gossip/madhubala-ek-ishq-ek-junoon-will-rk-and-madhu-have-unprotected-sex/