If you are having a BBL with harvest of fat by liposuction alone (no tummy tuck or other procedures) than you may resume having intercourse whenever you are comfortable. Obviously in the very beginning you will be sore and you will have to wear a compression garment. I would not remove the garment for intercourse in the first 2 weeks as this is an important time for healing. With all that said it may be best to plan on 1-2 weeks of time off prior to intercourse.
All the best,
Dr Remus Repta