A:The main factor to consider when delaying a Ghusl is that it must not affect a Salaah. Salaah must be made on time and it must not become Qadhaa.
Sexual intercourse more than once without a Ghusl in-between is permissible. Although it is permissible to have multiple discharges and then have one bath at the end, it is better to have a bath after every discharge. If not, then at least Wudhu should be made between every discharge. If a bath or Wudhu was not taken between discharges, no sin will be incurred. (Raddul Muhtaar V2 P12)
Sleeping without Wudhu after intercourse is also permissible.
Allah Ta’aala knows best.
Moulana Yusuf Laher